java.lang
Class StringBuilder

java.lang.Object sample code for java.lang.Object definition code for java.lang.Object 
  extended by java.lang.StringBuilder
All Implemented Interfaces:
Serializable sample code for java.io.Serializable definition code for java.io.Serializable , Appendable sample code for java.lang.Appendable definition code for java.lang.Appendable , CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence

public final class StringBuilder
extends Object sample code for java.lang.Object definition code for java.lang.Object
implements Serializable sample code for java.io.Serializable definition code for java.io.Serializable , CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence

A mutable sequence of characters. This class provides an API compatible with StringBuffer, but with no guarantee of synchronization. This class is designed for use as a drop-in replacement for StringBuffer in places where the string buffer was being used by a single thread (as is generally the case). Where possible, it is recommended that this class be used in preference to StringBuffer as it will be faster under most implementations.

The principal operations on a StringBuilder are the append and insert methods, which are overloaded so as to accept data of any type. Each effectively converts a given datum to a string and then appends or inserts the characters of that string to the string builder. The append method always adds these characters at the end of the builder; the insert method adds the characters at a specified point.

For example, if z refers to a string builder object whose current contents are "start", then the method call z.append("le") would cause the string builder to contain "startle", whereas z.insert(4, "le") would alter the string builder to contain "starlet".

In general, if sb refers to an instance of a StringBuilder, then sb.append(x) has the same effect as sb.insert(sb.length(), x). Every string builder has a capacity. As long as the length of the character sequence contained in the string builder does not exceed the capacity, it is not necessary to allocate a new internal buffer. If the internal buffer overflows, it is automatically made larger.

Instances of StringBuilder are not safe for use by multiple threads. If such synchronization is required then it is recommended that StringBuffer sample code for java.lang.StringBuffer definition code for java.lang.StringBuffer be used.

Since:
1.5
See Also:
StringBuffer sample code for java.lang.StringBuffer definition code for java.lang.StringBuffer , String sample code for java.lang.String definition code for java.lang.String , Serialized Form

Constructor Summary
StringBuilder sample code for java.lang.StringBuilder.StringBuilder() definition code for java.lang.StringBuilder.StringBuilder() ()
          Constructs a string builder with no characters in it and an initial capacity of 16 characters.
StringBuilder sample code for java.lang.StringBuilder.StringBuilder(java.lang.CharSequence) definition code for java.lang.StringBuilder.StringBuilder(java.lang.CharSequence) (CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  seq)
          Constructs a string builder that contains the same characters as the specified CharSequence.
StringBuilder sample code for java.lang.StringBuilder.StringBuilder(int) definition code for java.lang.StringBuilder.StringBuilder(int) (int capacity)
          Constructs a string builder with no characters in it and an initial capacity specified by the capacity argument.
StringBuilder sample code for java.lang.StringBuilder.StringBuilder(java.lang.String) definition code for java.lang.StringBuilder.StringBuilder(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  str)
          Constructs a string builder initialized to the contents of the specified string.
 
Method Summary
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(boolean) definition code for java.lang.StringBuilder.append(boolean) (boolean b)
          Appends the string representation of the boolean argument to the sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(char) definition code for java.lang.StringBuilder.append(char) (char c)
          Appends the string representation of the char argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(char[]) definition code for java.lang.StringBuilder.append(char[]) (char[] str)
          Appends the string representation of the char array argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(char[], int, int) definition code for java.lang.StringBuilder.append(char[], int, int) (char[] str, int offset, int len)
          Appends the string representation of a subarray of the char array argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(java.lang.CharSequence) definition code for java.lang.StringBuilder.append(java.lang.CharSequence) (CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s)
          Appends the specified character sequence to this Appendable.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(java.lang.CharSequence, int, int) definition code for java.lang.StringBuilder.append(java.lang.CharSequence, int, int) (CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s, int start, int end)
          Appends a subsequence of the specified CharSequence to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(double) definition code for java.lang.StringBuilder.append(double) (double d)
          Appends the string representation of the double argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(float) definition code for java.lang.StringBuilder.append(float) (float f)
          Appends the string representation of the float argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(int) definition code for java.lang.StringBuilder.append(int) (int i)
          Appends the string representation of the int argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(long) definition code for java.lang.StringBuilder.append(long) (long lng)
          Appends the string representation of the long argument to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(java.lang.Object) definition code for java.lang.StringBuilder.append(java.lang.Object) (Object sample code for java.lang.Object definition code for java.lang.Object  obj)
          Appends the string representation of the Object argument.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  str)
          Appends the specified string to this character sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder append sample code for java.lang.StringBuilder.append(java.lang.StringBuffer) definition code for java.lang.StringBuilder.append(java.lang.StringBuffer) (StringBuffer sample code for java.lang.StringBuffer definition code for java.lang.StringBuffer  sb)
          Appends the specified StringBuffer to this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder appendCodePoint sample code for java.lang.StringBuilder.appendCodePoint(int) definition code for java.lang.StringBuilder.appendCodePoint(int) (int codePoint)
          Appends the string representation of the codePoint argument to this sequence.
 int capacity sample code for java.lang.StringBuilder.capacity() definition code for java.lang.StringBuilder.capacity() ()
          Returns the current capacity.
 char charAt sample code for java.lang.StringBuilder.charAt(int) definition code for java.lang.StringBuilder.charAt(int) (int index)
          Returns the char value in this sequence at the specified index.
 int codePointAt sample code for java.lang.StringBuilder.codePointAt(int) definition code for java.lang.StringBuilder.codePointAt(int) (int index)
          Returns the character (Unicode code point) at the specified index.
 int codePointBefore sample code for java.lang.StringBuilder.codePointBefore(int) definition code for java.lang.StringBuilder.codePointBefore(int) (int index)
          Returns the character (Unicode code point) before the specified index.
 int codePointCount sample code for java.lang.StringBuilder.codePointCount(int, int) definition code for java.lang.StringBuilder.codePointCount(int, int) (int beginIndex, int endIndex)
          Returns the number of Unicode code points in the specified text range of this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder delete sample code for java.lang.StringBuilder.delete(int, int) definition code for java.lang.StringBuilder.delete(int, int) (int start, int end)
          Removes the characters in a substring of this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder deleteCharAt sample code for java.lang.StringBuilder.deleteCharAt(int) definition code for java.lang.StringBuilder.deleteCharAt(int) (int index)
          Removes the char at the specified position in this sequence.
 void ensureCapacity sample code for java.lang.StringBuilder.ensureCapacity(int) definition code for java.lang.StringBuilder.ensureCapacity(int) (int minimumCapacity)
          Ensures that the capacity is at least equal to the specified minimum.
 void getChars sample code for java.lang.StringBuilder.getChars(int, int, char[], int) definition code for java.lang.StringBuilder.getChars(int, int, char[], int) (int srcBegin, int srcEnd, char[] dst, int dstBegin)
          Characters are copied from this sequence into the destination character array dst.
 int indexOf sample code for java.lang.StringBuilder.indexOf(java.lang.String) definition code for java.lang.StringBuilder.indexOf(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  str)
          Returns the index within this string of the first occurrence of the specified substring.
 int indexOf sample code for java.lang.StringBuilder.indexOf(java.lang.String, int) definition code for java.lang.StringBuilder.indexOf(java.lang.String, int) (String sample code for java.lang.String definition code for java.lang.String  str, int fromIndex)
          Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, boolean) definition code for java.lang.StringBuilder.insert(int, boolean) (int offset, boolean b)
          Inserts the string representation of the boolean argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, char) definition code for java.lang.StringBuilder.insert(int, char) (int offset, char c)
          Inserts the string representation of the char argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, char[]) definition code for java.lang.StringBuilder.insert(int, char[]) (int offset, char[] str)
          Inserts the string representation of the char array argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, char[], int, int) definition code for java.lang.StringBuilder.insert(int, char[], int, int) (int index, char[] str, int offset, int len)
          Inserts the string representation of a subarray of the str array argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, java.lang.CharSequence) definition code for java.lang.StringBuilder.insert(int, java.lang.CharSequence) (int dstOffset, CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s)
          Inserts the specified CharSequence into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, java.lang.CharSequence, int, int) definition code for java.lang.StringBuilder.insert(int, java.lang.CharSequence, int, int) (int dstOffset, CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s, int start, int end)
          Inserts a subsequence of the specified CharSequence into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, double) definition code for java.lang.StringBuilder.insert(int, double) (int offset, double d)
          Inserts the string representation of the double argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, float) definition code for java.lang.StringBuilder.insert(int, float) (int offset, float f)
          Inserts the string representation of the float argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, int) definition code for java.lang.StringBuilder.insert(int, int) (int offset, int i)
          Inserts the string representation of the second int argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, long) definition code for java.lang.StringBuilder.insert(int, long) (int offset, long l)
          Inserts the string representation of the long argument into this sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, java.lang.Object) definition code for java.lang.StringBuilder.insert(int, java.lang.Object) (int offset, Object sample code for java.lang.Object definition code for java.lang.Object  obj)
          Inserts the string representation of the Object argument into this character sequence.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder insert sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) (int offset, String sample code for java.lang.String definition code for java.lang.String  str)
          Inserts the string into this character sequence.
 int lastIndexOf sample code for java.lang.StringBuilder.lastIndexOf(java.lang.String) definition code for java.lang.StringBuilder.lastIndexOf(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  str)
          Returns the index within this string of the rightmost occurrence of the specified substring.
 int lastIndexOf sample code for java.lang.StringBuilder.lastIndexOf(java.lang.String, int) definition code for java.lang.StringBuilder.lastIndexOf(java.lang.String, int) (String sample code for java.lang.String definition code for java.lang.String  str, int fromIndex)
          Returns the index within this string of the last occurrence of the specified substring.
 int length sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length() ()
          Returns the length (character count).
 int offsetByCodePoints sample code for java.lang.StringBuilder.offsetByCodePoints(int, int) definition code for java.lang.StringBuilder.offsetByCodePoints(int, int) (int index, int codePointOffset)
          Returns the index within this sequence that is offset from the given index by codePointOffset code points.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder replace sample code for java.lang.StringBuilder.replace(int, int, java.lang.String) definition code for java.lang.StringBuilder.replace(int, int, java.lang.String) (int start, int end, String sample code for java.lang.String definition code for java.lang.String  str)
          Replaces the characters in a substring of this sequence with characters in the specified String.
 StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder reverse sample code for java.lang.StringBuilder.reverse() definition code for java.lang.StringBuilder.reverse() ()
          Causes this character sequence to be replaced by the reverse of the sequence.
 void setCharAt sample code for java.lang.StringBuilder.setCharAt(int, char) definition code for java.lang.StringBuilder.setCharAt(int, char) (int index, char ch)
          The character at the specified index is set to ch.
 void setLength sample code for java.lang.StringBuilder.setLength(int) definition code for java.lang.StringBuilder.setLength(int) (int newLength)
          Sets the length of the character sequence.
 CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence subSequence sample code for java.lang.StringBuilder.subSequence(int, int) definition code for java.lang.StringBuilder.subSequence(int, int) (int start, int end)
          Returns a new character sequence that is a subsequence of this sequence.
 String sample code for java.lang.String definition code for java.lang.String substring sample code for java.lang.StringBuilder.substring(int) definition code for java.lang.StringBuilder.substring(int) (int start)
          Returns a new String that contains a subsequence of characters currently contained in this character sequence.
 String sample code for java.lang.String definition code for java.lang.String substring sample code for java.lang.StringBuilder.substring(int, int) definition code for java.lang.StringBuilder.substring(int, int) (int start, int end)
          Returns a new String that contains a subsequence of characters currently contained in this sequence.
 String sample code for java.lang.String definition code for java.lang.String toString sample code for java.lang.StringBuilder.toString() definition code for java.lang.StringBuilder.toString() ()
          Returns a string representing the data in this sequence.
 void trimToSize sample code for java.lang.StringBuilder.trimToSize() definition code for java.lang.StringBuilder.trimToSize() ()
          Attempts to reduce storage used for the character sequence.
 
Methods inherited from class java.lang.Object sample code for java.lang.Object definition code for java.lang.Object
clone sample code for java.lang.Object.clone() definition code for java.lang.Object.clone() , equals sample code for java.lang.Object.equals(java.lang.Object) definition code for java.lang.Object.equals(java.lang.Object) , finalize sample code for java.lang.Object.finalize() definition code for java.lang.Object.finalize() , getClass sample code for java.lang.Object.getClass() definition code for java.lang.Object.getClass() , hashCode sample code for java.lang.Object.hashCode() definition code for java.lang.Object.hashCode() , notify sample code for java.lang.Object.notify() definition code for java.lang.Object.notify() , notifyAll sample code for java.lang.Object.notifyAll() definition code for java.lang.Object.notifyAll() , wait sample code for java.lang.Object.wait() definition code for java.lang.Object.wait() , wait sample code for java.lang.Object.wait(long) definition code for java.lang.Object.wait(long) , wait sample code for java.lang.Object.wait(long, int) definition code for java.lang.Object.wait(long, int)
 
Methods inherited from interface java.lang.CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence
charAt sample code for java.lang.CharSequence.charAt(int) definition code for java.lang.CharSequence.charAt(int) , length sample code for java.lang.CharSequence.length() definition code for java.lang.CharSequence.length() , subSequence sample code for java.lang.CharSequence.subSequence(int, int) definition code for java.lang.CharSequence.subSequence(int, int)
 

Constructor Detail

StringBuilder sample code for java.lang.StringBuilder() definition code for java.lang.StringBuilder()

public StringBuilder()
Constructs a string builder with no characters in it and an initial capacity of 16 characters.


StringBuilder sample code for java.lang.StringBuilder(int) definition code for java.lang.StringBuilder(int)

public StringBuilder(int capacity)
Constructs a string builder with no characters in it and an initial capacity specified by the capacity argument.

Parameters:
capacity - the initial capacity.
Throws:
NegativeArraySizeException sample code for java.lang.NegativeArraySizeException definition code for java.lang.NegativeArraySizeException - if the capacity argument is less than 0.

StringBuilder sample code for java.lang.StringBuilder(java.lang.String) definition code for java.lang.StringBuilder(java.lang.String)

public StringBuilder(String sample code for java.lang.String definition code for java.lang.String  str)
Constructs a string builder initialized to the contents of the specified string. The initial capacity of the string builder is 16 plus the length of the string argument.

Parameters:
str - the initial contents of the buffer.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if str is null

StringBuilder sample code for java.lang.StringBuilder(java.lang.CharSequence) definition code for java.lang.StringBuilder(java.lang.CharSequence)

public StringBuilder(CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  seq)
Constructs a string builder that contains the same characters as the specified CharSequence. The initial capacity of the string builder is 16 plus the length of the CharSequence argument.

Parameters:
seq - the sequence to copy.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if seq is null
Method Detail

append sample code for java.lang.StringBuilder.append(java.lang.Object) definition code for java.lang.StringBuilder.append(java.lang.Object)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(Object sample code for java.lang.Object definition code for java.lang.Object  obj)
Appends the string representation of the Object argument.

The argument is converted to a string as if by the method String.valueOf, and the characters of that string are then appended to this sequence.

Parameters:
obj - an Object.
Returns:
a reference to this object.
See Also:
String.valueOf(java.lang.Object) sample code for java.lang.String.valueOf(java.lang.Object) definition code for java.lang.String.valueOf(java.lang.Object) , append(java.lang.String) sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

append sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(String sample code for java.lang.String definition code for java.lang.String  str)
Appends the specified string to this character sequence.

The characters of the String argument are appended, in order, increasing the length of this sequence by the length of the argument. If str is null, then the four characters "null" are appended.

Let n be the length of this character sequence just prior to execution of the append method. Then the character at index k in the new character sequence is equal to the character at index k in the old character sequence, if k is less than n; otherwise, it is equal to the character at index k-n in the argument str.

Parameters:
str - a string.
Returns:
a reference to this object.

append sample code for java.lang.StringBuilder.append(java.lang.StringBuffer) definition code for java.lang.StringBuilder.append(java.lang.StringBuffer)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(StringBuffer sample code for java.lang.StringBuffer definition code for java.lang.StringBuffer  sb)
Appends the specified StringBuffer to this sequence.

The characters of the StringBuffer argument are appended, in order, to this sequence, increasing the length of this sequence by the length of the argument. If sb is null, then the four characters "null" are appended to this sequence.

Let n be the length of this character sequence just prior to execution of the append method. Then the character at index k in the new character sequence is equal to the character at index k in the old character sequence, if k is less than n; otherwise, it is equal to the character at index k-n in the argument sb.

Parameters:
sb - the StringBuffer to append.
Returns:
a reference to this object.

append sample code for java.lang.StringBuilder.append(java.lang.CharSequence) definition code for java.lang.StringBuilder.append(java.lang.CharSequence)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s)
Description copied from interface: Appendable sample code for java.lang.Appendable.append(java.lang.CharSequence) definition code for java.lang.Appendable.append(java.lang.CharSequence)
Appends the specified character sequence to this Appendable.

Depending on which class implements the character sequence csq, the entire sequence may not be appended. For instance, if csq is a CharBuffer sample code for java.nio.CharBuffer definition code for java.nio.CharBuffer then the subsequence to append is defined by the buffer's position and limit.

Specified by:
append sample code for java.lang.Appendable.append(java.lang.CharSequence) definition code for java.lang.Appendable.append(java.lang.CharSequence) in interface Appendable sample code for java.lang.Appendable definition code for java.lang.Appendable
Parameters:
s - The character sequence to append. If csq is null, then the four characters "null" are appended to this Appendable.
Returns:
A reference to this Appendable
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException

append sample code for java.lang.StringBuilder.append(java.lang.CharSequence, int, int) definition code for java.lang.StringBuilder.append(java.lang.CharSequence, int, int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s,
                            int start,
                            int end)
Appends a subsequence of the specified CharSequence to this sequence.

Characters of the argument s, starting at index start, are appended, in order, to the contents of this sequence up to the (exclusive) index end. The length of this sequence is increased by the value of end - start.

Let n be the length of this character sequence just prior to execution of the append method. Then the character at index k in this character sequence becomes equal to the character at index k in this sequence, if k is less than n; otherwise, it is equal to the character at index k+start-n in the argument s.

If s is null, then this method appends characters as if the s parameter was a sequence containing the four characters "null".

Specified by:
append sample code for java.lang.Appendable.append(java.lang.CharSequence, int, int) definition code for java.lang.Appendable.append(java.lang.CharSequence, int, int) in interface Appendable sample code for java.lang.Appendable definition code for java.lang.Appendable
Parameters:
s - the sequence to append.
start - the starting index of the subsequence to be appended.
end - the end index of the subsequence to be appended.
Returns:
a reference to this object.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if start or end are negative, or start is greater than end or end is greater than s.length()

append sample code for java.lang.StringBuilder.append(char[]) definition code for java.lang.StringBuilder.append(char[])

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(char[] str)
Appends the string representation of the char array argument to this sequence.

The characters of the array argument are appended, in order, to the contents of this sequence. The length of this sequence increases by the length of the argument.

The overall effect is exactly as if the argument were converted to a string by the method String.valueOf(char[]) sample code for java.lang.String.valueOf(char[]) definition code for java.lang.String.valueOf(char[]) and the characters of that string were then appended sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String) to this character sequence.

Parameters:
str - the characters to be appended.
Returns:
a reference to this object.

append sample code for java.lang.StringBuilder.append(char[], int, int) definition code for java.lang.StringBuilder.append(char[], int, int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(char[] str,
                            int offset,
                            int len)
Appends the string representation of a subarray of the char array argument to this sequence.

Characters of the char array str, starting at index offset, are appended, in order, to the contents of this sequence. The length of this sequence increases by the value of len.

The overall effect is exactly as if the arguments were converted to a string by the method String.valueOf(char[],int,int) sample code for java.lang.String.valueOf(char[], int, int) definition code for java.lang.String.valueOf(char[], int, int) and the characters of that string were then appended sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String) to this character sequence.

Parameters:
str - the characters to be appended.
offset - the index of the first char to append.
len - the number of chars to append.
Returns:
a reference to this object.

append sample code for java.lang.StringBuilder.append(boolean) definition code for java.lang.StringBuilder.append(boolean)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(boolean b)
Appends the string representation of the boolean argument to the sequence.

The argument is converted to a string as if by the method String.valueOf, and the characters of that string are then appended to this sequence.

Parameters:
b - a boolean.
Returns:
a reference to this object.
See Also:
String.valueOf(boolean) sample code for java.lang.String.valueOf(boolean) definition code for java.lang.String.valueOf(boolean) , append(java.lang.String) sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

append sample code for java.lang.StringBuilder.append(char) definition code for java.lang.StringBuilder.append(char)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(char c)
Appends the string representation of the char argument to this sequence.

The argument is appended to the contents of this sequence. The length of this sequence increases by 1.

The overall effect is exactly as if the argument were converted to a string by the method String.valueOf(char) sample code for java.lang.String.valueOf(char) definition code for java.lang.String.valueOf(char) and the character in that string were then appended sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String) to this character sequence.

Specified by:
append sample code for java.lang.Appendable.append(char) definition code for java.lang.Appendable.append(char) in interface Appendable sample code for java.lang.Appendable definition code for java.lang.Appendable
Parameters:
c - a char.
Returns:
a reference to this object.

append sample code for java.lang.StringBuilder.append(int) definition code for java.lang.StringBuilder.append(int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(int i)
Appends the string representation of the int argument to this sequence.

The argument is converted to a string as if by the method String.valueOf, and the characters of that string are then appended to this sequence.

Parameters:
i - an int.
Returns:
a reference to this object.
See Also:
String.valueOf(int) sample code for java.lang.String.valueOf(int) definition code for java.lang.String.valueOf(int) , append(java.lang.String) sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

append sample code for java.lang.StringBuilder.append(long) definition code for java.lang.StringBuilder.append(long)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(long lng)
Appends the string representation of the long argument to this sequence.

The argument is converted to a string as if by the method String.valueOf, and the characters of that string are then appended to this sequence.

Parameters:
lng - a long.
Returns:
a reference to this object.
See Also:
String.valueOf(long) sample code for java.lang.String.valueOf(long) definition code for java.lang.String.valueOf(long) , append(java.lang.String) sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

append sample code for java.lang.StringBuilder.append(float) definition code for java.lang.StringBuilder.append(float)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(float f)
Appends the string representation of the float argument to this sequence.

The argument is converted to a string as if by the method String.valueOf, and the characters of that string are then appended to this string sequence.

Parameters:
f - a float.
Returns:
a reference to this object.
See Also:
String.valueOf(float) sample code for java.lang.String.valueOf(float) definition code for java.lang.String.valueOf(float) , append(java.lang.String) sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

append sample code for java.lang.StringBuilder.append(double) definition code for java.lang.StringBuilder.append(double)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  append(double d)
Appends the string representation of the double argument to this sequence.

The argument is converted to a string as if by the method String.valueOf, and the characters of that string are then appended to this sequence.

Parameters:
d - a double.
Returns:
a reference to this object.
See Also:
String.valueOf(double) sample code for java.lang.String.valueOf(double) definition code for java.lang.String.valueOf(double) , append(java.lang.String) sample code for java.lang.StringBuilder.append(java.lang.String) definition code for java.lang.StringBuilder.append(java.lang.String)

appendCodePoint sample code for java.lang.StringBuilder.appendCodePoint(int) definition code for java.lang.StringBuilder.appendCodePoint(int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  appendCodePoint(int codePoint)
Appends the string representation of the codePoint argument to this sequence.

The argument is appended to the contents of this sequence. The length of this sequence increases by Character.charCount(codePoint) sample code for java.lang.Character.charCount(int) definition code for java.lang.Character.charCount(int) .

The overall effect is exactly as if the argument were converted to a char array by the method Character.toChars(int) sample code for java.lang.Character.toChars(int) definition code for java.lang.Character.toChars(int) and the character in that array were then appended sample code for java.lang.StringBuilder.append(char[]) definition code for java.lang.StringBuilder.append(char[]) to this character sequence.

Parameters:
codePoint - a Unicode code point
Returns:
a reference to this object.
Since:
1.5

delete sample code for java.lang.StringBuilder.delete(int, int) definition code for java.lang.StringBuilder.delete(int, int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  delete(int start,
                            int end)
Removes the characters in a substring of this sequence. The substring begins at the specified start and extends to the character at index end - 1 or to the end of the sequence if no such character exists. If start is equal to end, no changes are made.

Parameters:
start - The beginning index, inclusive.
end - The ending index, exclusive.
Returns:
This object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if start is negative, greater than length(), or greater than end.

deleteCharAt sample code for java.lang.StringBuilder.deleteCharAt(int) definition code for java.lang.StringBuilder.deleteCharAt(int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  deleteCharAt(int index)
Removes the char at the specified position in this sequence. This sequence is shortened by one char.

Note: If the character at the given index is a supplementary character, this method does not remove the entire character. If correct handling of supplementary characters is required, determine the number of chars to remove by calling Character.charCount(thisSequence.codePointAt(index)), where thisSequence is this sequence.

Parameters:
index - Index of char to remove
Returns:
This object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the index is negative or greater than or equal to length().

replace sample code for java.lang.StringBuilder.replace(int, int, java.lang.String) definition code for java.lang.StringBuilder.replace(int, int, java.lang.String)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  replace(int start,
                             int end,
                             String sample code for java.lang.String definition code for java.lang.String  str)
Replaces the characters in a substring of this sequence with characters in the specified String. The substring begins at the specified start and extends to the character at index end - 1 or to the end of the sequence if no such character exists. First the characters in the substring are removed and then the specified String is inserted at start. (This sequence will be lengthened to accommodate the specified String if necessary.)

Parameters:
start - The beginning index, inclusive.
end - The ending index, exclusive.
str - String that will replace previous contents.
Returns:
This object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if start is negative, greater than length(), or greater than end.

insert sample code for java.lang.StringBuilder.insert(int, char[], int, int) definition code for java.lang.StringBuilder.insert(int, char[], int, int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int index,
                            char[] str,
                            int offset,
                            int len)
Inserts the string representation of a subarray of the str array argument into this sequence. The subarray begins at the specified offset and extends len chars. The characters of the subarray are inserted into this sequence at the position indicated by index. The length of this sequence increases by len chars.

Parameters:
index - position at which to insert subarray.
str - A char array.
offset - the index of the first char in subarray to be inserted.
len - the number of chars in the subarray to be inserted.
Returns:
This object
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if index is negative or greater than length(), or offset or len are negative, or (offset+len) is greater than str.length.

insert sample code for java.lang.StringBuilder.insert(int, java.lang.Object) definition code for java.lang.StringBuilder.insert(int, java.lang.Object)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            Object sample code for java.lang.Object definition code for java.lang.Object  obj)
Inserts the string representation of the Object argument into this character sequence.

The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this sequence at the indicated offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
obj - an Object.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
String.valueOf(java.lang.Object) sample code for java.lang.String.valueOf(java.lang.Object) definition code for java.lang.String.valueOf(java.lang.Object) , insert(int, java.lang.String) sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) , length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            String sample code for java.lang.String definition code for java.lang.String  str)
Inserts the string into this character sequence.

The characters of the String argument are inserted, in order, into this sequence at the indicated offset, moving up any characters originally above that position and increasing the length of this sequence by the length of the argument. If str is null, then the four characters "null" are inserted into this sequence.

The character at index k in the new character sequence is equal to:

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
str - a string.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, char[]) definition code for java.lang.StringBuilder.insert(int, char[])

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            char[] str)
Inserts the string representation of the char array argument into this sequence.

The characters of the array argument are inserted into the contents of this sequence at the position indicated by offset. The length of this sequence increases by the length of the argument.

The overall effect is exactly as if the argument were converted to a string by the method String.valueOf(char[]) sample code for java.lang.String.valueOf(char[]) definition code for java.lang.String.valueOf(char[]) and the characters of that string were then inserted sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) into this character sequence at the position indicated by offset.

Parameters:
offset - the offset.
str - a character array.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.

insert sample code for java.lang.StringBuilder.insert(int, java.lang.CharSequence) definition code for java.lang.StringBuilder.insert(int, java.lang.CharSequence)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int dstOffset,
                            CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s)
Inserts the specified CharSequence into this sequence.

The characters of the CharSequence argument are inserted, in order, into this sequence at the indicated offset, moving up any characters originally above that position and increasing the length of this sequence by the length of the argument s.

The result of this method is exactly the same as if it were an invocation of this object's insert(dstOffset, s, 0, s.length()) method.

If s is null, then the four characters "null" are inserted into this sequence.

Parameters:
dstOffset - the offset.
s - the sequence to be inserted
Returns:
a reference to this object.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the offset is invalid.

insert sample code for java.lang.StringBuilder.insert(int, java.lang.CharSequence, int, int) definition code for java.lang.StringBuilder.insert(int, java.lang.CharSequence, int, int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int dstOffset,
                            CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  s,
                            int start,
                            int end)
Inserts a subsequence of the specified CharSequence into this sequence.

The subsequence of the argument s specified by start and end are inserted, in order, into this sequence at the specified destination offset, moving up any characters originally above that position. The length of this sequence is increased by end - start.

The character at index k in this sequence becomes equal to:

The dstOffset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

The start argument must be nonnegative, and not greater than end.

The end argument must be greater than or equal to start, and less than or equal to the length of s.

If s is null, then this method inserts characters as if the s parameter was a sequence containing the four characters "null".

Parameters:
dstOffset - the offset in this sequence.
s - the sequence to be inserted.
start - the starting index of the subsequence to be inserted.
end - the end index of the subsequence to be inserted.
Returns:
a reference to this object.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if dstOffset is negative or greater than this.length(), or start or end are negative, or start is greater than end or end is greater than s.length()

insert sample code for java.lang.StringBuilder.insert(int, boolean) definition code for java.lang.StringBuilder.insert(int, boolean)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            boolean b)
Inserts the string representation of the boolean argument into this sequence.

The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this sequence at the indicated offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
b - a boolean.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
String.valueOf(boolean) sample code for java.lang.String.valueOf(boolean) definition code for java.lang.String.valueOf(boolean) , insert(int, java.lang.String) sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) , length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, char) definition code for java.lang.StringBuilder.insert(int, char)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            char c)
Inserts the string representation of the char argument into this sequence.

The second argument is inserted into the contents of this sequence at the position indicated by offset. The length of this sequence increases by one.

The overall effect is exactly as if the argument were converted to a string by the method String.valueOf(char) sample code for java.lang.String.valueOf(char) definition code for java.lang.String.valueOf(char) and the character in that string were then inserted sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) into this character sequence at the position indicated by offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
c - a char.
Returns:
a reference to this object.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the offset is invalid.
See Also:
length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, int) definition code for java.lang.StringBuilder.insert(int, int)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            int i)
Inserts the string representation of the second int argument into this sequence.

The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this sequence at the indicated offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
i - an int.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
String.valueOf(int) sample code for java.lang.String.valueOf(int) definition code for java.lang.String.valueOf(int) , insert(int, java.lang.String) sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) , length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, long) definition code for java.lang.StringBuilder.insert(int, long)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            long l)
Inserts the string representation of the long argument into this sequence.

The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this sequence at the position indicated by offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
l - a long.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
String.valueOf(long) sample code for java.lang.String.valueOf(long) definition code for java.lang.String.valueOf(long) , insert(int, java.lang.String) sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) , length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, float) definition code for java.lang.StringBuilder.insert(int, float)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            float f)
Inserts the string representation of the float argument into this sequence.

The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this sequence at the indicated offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
f - a float.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
String.valueOf(float) sample code for java.lang.String.valueOf(float) definition code for java.lang.String.valueOf(float) , insert(int, java.lang.String) sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) , length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

insert sample code for java.lang.StringBuilder.insert(int, double) definition code for java.lang.StringBuilder.insert(int, double)

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  insert(int offset,
                            double d)
Inserts the string representation of the double argument into this sequence.

The second argument is converted to a string as if by the method String.valueOf, and the characters of that string are then inserted into this sequence at the indicated offset.

The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Parameters:
offset - the offset.
d - a double.
Returns:
a reference to this object.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if the offset is invalid.
See Also:
String.valueOf(double) sample code for java.lang.String.valueOf(double) definition code for java.lang.String.valueOf(double) , insert(int, java.lang.String) sample code for java.lang.StringBuilder.insert(int, java.lang.String) definition code for java.lang.StringBuilder.insert(int, java.lang.String) , length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length()

indexOf sample code for java.lang.StringBuilder.indexOf(java.lang.String) definition code for java.lang.StringBuilder.indexOf(java.lang.String)

public int indexOf(String sample code for java.lang.String definition code for java.lang.String  str)
Returns the index within this string of the first occurrence of the specified substring. The integer returned is the smallest value k such that:
 this.toString().startsWith(str, k)
 
is true.

Parameters:
str - any string.
Returns:
if the string argument occurs as a substring within this object, then the index of the first character of the first such substring is returned; if it does not occur as a substring, -1 is returned.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if str is null.

indexOf sample code for java.lang.StringBuilder.indexOf(java.lang.String, int) definition code for java.lang.StringBuilder.indexOf(java.lang.String, int)

public int indexOf(String sample code for java.lang.String definition code for java.lang.String  str,
                   int fromIndex)
Returns the index within this string of the first occurrence of the specified substring, starting at the specified index. The integer returned is the smallest value k for which:
     k >= Math.min(fromIndex, str.length()) &&
                   this.toString().startsWith(str, k)
 
If no such value of k exists, then -1 is returned.

Parameters:
str - the substring for which to search.
fromIndex - the index from which to start the search.
Returns:
the index within this string of the first occurrence of the specified substring, starting at the specified index.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if str is null.

lastIndexOf sample code for java.lang.StringBuilder.lastIndexOf(java.lang.String) definition code for java.lang.StringBuilder.lastIndexOf(java.lang.String)

public int lastIndexOf(String sample code for java.lang.String definition code for java.lang.String  str)
Returns the index within this string of the rightmost occurrence of the specified substring. The rightmost empty string "" is considered to occur at the index value this.length(). The returned index is the largest value k such that
 this.toString().startsWith(str, k)
 
is true.

Parameters:
str - the substring to search for.
Returns:
if the string argument occurs one or more times as a substring within this object, then the index of the first character of the last such substring is returned. If it does not occur as a substring, -1 is returned.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if str is null.

lastIndexOf sample code for java.lang.StringBuilder.lastIndexOf(java.lang.String, int) definition code for java.lang.StringBuilder.lastIndexOf(java.lang.String, int)

public int lastIndexOf(String sample code for java.lang.String definition code for java.lang.String  str,
                       int fromIndex)
Returns the index within this string of the last occurrence of the specified substring. The integer returned is the largest value k such that:
     k <= Math.min(fromIndex, str.length()) &&
                   this.toString().startsWith(str, k)
 
If no such value of k exists, then -1 is returned.

Parameters:
str - the substring to search for.
fromIndex - the index to start the search from.
Returns:
the index within this sequence of the last occurrence of the specified substring.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if str is null.

reverse sample code for java.lang.StringBuilder.reverse() definition code for java.lang.StringBuilder.reverse()

public StringBuilder sample code for java.lang.StringBuilder definition code for java.lang.StringBuilder  reverse()
Causes this character sequence to be replaced by the reverse of the sequence. If there are any surrogate pairs included in the sequence, these are treated as single characters for the reverse operation. Thus, the order of the high-low surrogates is never reversed. Let n be the character length of this character sequence (not the length in char values) just prior to execution of the reverse method. Then the character at index k in the new character sequence is equal to the character at index n-k-1 in the old character sequence.

Note that the reverse operation may result in producing surrogate pairs that were unpaired low-surrogates and high-surrogates before the operation. For example, reversing "\uDC00\uD800" produces "\uD800\uDC00" which is a valid surrogate pair.

Returns:
a reference to this object.

toString sample code for java.lang.StringBuilder.toString() definition code for java.lang.StringBuilder.toString()

public String sample code for java.lang.String definition code for java.lang.String  toString()
Returns a string representing the data in this sequence. A new String object is allocated and initialized to contain the character sequence currently represented by this object. This String is then returned. Subsequent changes to this sequence do not affect the contents of the String.

Specified by:
toString sample code for java.lang.CharSequence.toString() definition code for java.lang.CharSequence.toString() in interface CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence
Returns:
a string representation of this sequence of characters.

length sample code for java.lang.AbstractStringBuilder.length() definition code for java.lang.AbstractStringBuilder.length()

public int length()
Returns the length (character count).

Specified by:
length sample code for java.lang.CharSequence.length() definition code for java.lang.CharSequence.length() in interface CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence
Returns:
the length of the sequence of characters currently represented by this object

capacity sample code for java.lang.AbstractStringBuilder.capacity() definition code for java.lang.AbstractStringBuilder.capacity()

public int capacity()
Returns the current capacity. The capacity is the amount of storage available for newly inserted characters, beyond which an allocation will occur.

Returns:
the current capacity

ensureCapacity sample code for java.lang.AbstractStringBuilder.ensureCapacity(int) definition code for java.lang.AbstractStringBuilder.ensureCapacity(int)

public void ensureCapacity(int minimumCapacity)
Ensures that the capacity is at least equal to the specified minimum. If the current capacity is less than the argument, then a new internal array is allocated with greater capacity. The new capacity is the larger of: If the minimumCapacity argument is nonpositive, this method takes no action and simply returns.

Parameters:
minimumCapacity - the minimum desired capacity.

trimToSize sample code for java.lang.AbstractStringBuilder.trimToSize() definition code for java.lang.AbstractStringBuilder.trimToSize()

public void trimToSize()
Attempts to reduce storage used for the character sequence. If the buffer is larger than necessary to hold its current sequence of characters, then it may be resized to become more space efficient. Calling this method may, but is not required to, affect the value returned by a subsequent call to the capacity() sample code for java.lang.StringBuilder.capacity() definition code for java.lang.StringBuilder.capacity() method.


setLength sample code for java.lang.AbstractStringBuilder.setLength(int) definition code for java.lang.AbstractStringBuilder.setLength(int)

public void setLength(int newLength)
Sets the length of the character sequence. The sequence is changed to a new character sequence whose length is specified by the argument. For every nonnegative index k less than newLength, the character at index k in the new character sequence is the same as the character at index k in the old sequence if k is less than the length of the old character sequence; otherwise, it is the null character '\u0000'. In other words, if the newLength argument is less than the current length, the length is changed to the specified length.

If the newLength argument is greater than or equal to the current length, sufficient null characters ('\u0000') are appended so that length becomes the newLength argument.

The newLength argument must be greater than or equal to 0.

Parameters:
newLength - the new length
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the newLength argument is negative.

charAt sample code for java.lang.AbstractStringBuilder.charAt(int) definition code for java.lang.AbstractStringBuilder.charAt(int)

public char charAt(int index)
Returns the char value in this sequence at the specified index. The first char value is at index 0, the next at index 1, and so on, as in array indexing.

The index argument must be greater than or equal to 0, and less than the length of this sequence.

If the char value specified by the index is a surrogate, the surrogate value is returned.

Specified by:
charAt sample code for java.lang.CharSequence.charAt(int) definition code for java.lang.CharSequence.charAt(int) in interface CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence
Parameters:
index - the index of the desired char value.
Returns:
the char value at the specified index.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if index is negative or greater than or equal to length().

codePointAt sample code for java.lang.AbstractStringBuilder.codePointAt(int) definition code for java.lang.AbstractStringBuilder.codePointAt(int)

public int codePointAt(int index)
Returns the character (Unicode code point) at the specified index. The index refers to char values (Unicode code units) and ranges from 0 to length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length() - 1.

If the char value specified at the given index is in the high-surrogate range, the following index is less than the length of this sequence, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.

Parameters:
index - the index to the char values
Returns:
the code point value of the character at the index
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the index argument is negative or not less than the length of this sequence.

codePointBefore sample code for java.lang.AbstractStringBuilder.codePointBefore(int) definition code for java.lang.AbstractStringBuilder.codePointBefore(int)

public int codePointBefore(int index)
Returns the character (Unicode code point) before the specified index. The index refers to char values (Unicode code units) and ranges from 1 to length() sample code for java.lang.StringBuilder.length() definition code for java.lang.StringBuilder.length() .

If the char value at (index - 1) is in the low-surrogate range, (index - 2) is not negative, and the char value at (index - 2) is in the high-surrogate range, then the supplementary code point value of the surrogate pair is returned. If the char value at index - 1 is an unpaired low-surrogate or a high-surrogate, the surrogate value is returned.

Parameters:
index - the index following the code point that should be returned
Returns:
the Unicode code point value before the given index.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the index argument is less than 1 or greater than the length of this sequence.

codePointCount sample code for java.lang.AbstractStringBuilder.codePointCount(int, int) definition code for java.lang.AbstractStringBuilder.codePointCount(int, int)

public int codePointCount(int beginIndex,
                          int endIndex)
Returns the number of Unicode code points in the specified text range of this sequence. The text range begins at the specified beginIndex and extends to the char at index endIndex - 1. Thus the length (in chars) of the text range is endIndex-beginIndex. Unpaired surrogates within this sequence count as one code point each.

Parameters:
beginIndex - the index to the first char of the text range.
endIndex - the index after the last char of the text range.
Returns:
the number of Unicode code points in the specified text range
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this sequence, or beginIndex is larger than endIndex.

offsetByCodePoints sample code for java.lang.AbstractStringBuilder.offsetByCodePoints(int, int) definition code for java.lang.AbstractStringBuilder.offsetByCodePoints(int, int)

public int offsetByCodePoints(int index,
                              int codePointOffset)
Returns the index within this sequence that is offset from the given index by codePointOffset code points. Unpaired surrogates within the text range given by index and codePointOffset count as one code point each.

Parameters:
index - the index to be offset
codePointOffset - the offset in code points
Returns:
the index within this sequence
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if index is negative or larger then the length of this sequence, or if codePointOffset is positive and the subsequence starting with index has fewer than codePointOffset code points, or if codePointOffset is negative and the subsequence before index has fewer than the absolute value of codePointOffset code points.

getChars sample code for java.lang.AbstractStringBuilder.getChars(int, int, char[], int) definition code for java.lang.AbstractStringBuilder.getChars(int, int, char[], int)

public void getChars(int srcBegin,
                     int srcEnd,
                     char[] dst,
                     int dstBegin)
Characters are copied from this sequence into the destination character array dst. The first character to be copied is at index srcBegin; the last character to be copied is at index srcEnd-1. The total number of characters to be copied is srcEnd-srcBegin. The characters are copied into the subarray of dst starting at index dstBegin and ending at index:

 dstbegin + (srcEnd-srcBegin) - 1
 

Parameters:
srcBegin - start copying at this offset.
srcEnd - stop copying at this offset.
dst - the array to copy the data into.
dstBegin - offset into dst.
Throws:
NullPointerException sample code for java.lang.NullPointerException definition code for java.lang.NullPointerException - if dst is null.
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if any of the following is true:
  • srcBegin is negative
  • dstBegin is negative
  • the srcBegin argument is greater than the srcEnd argument.
  • srcEnd is greater than this.length().
  • dstBegin+srcEnd-srcBegin is greater than dst.length

setCharAt sample code for java.lang.AbstractStringBuilder.setCharAt(int, char) definition code for java.lang.AbstractStringBuilder.setCharAt(int, char)

public void setCharAt(int index,
                      char ch)
The character at the specified index is set to ch. This sequence is altered to represent a new character sequence that is identical to the old character sequence, except that it contains the character ch at position index.

The index argument must be greater than or equal to 0, and less than the length of this sequence.

Parameters:
index - the index of the character to modify.
ch - the new character.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if index is negative or greater than or equal to length().

substring sample code for java.lang.AbstractStringBuilder.substring(int) definition code for java.lang.AbstractStringBuilder.substring(int)

public String sample code for java.lang.String definition code for java.lang.String  substring(int start)
Returns a new String that contains a subsequence of characters currently contained in this character sequence. The substring begins at the specified index and extends to the end of this sequence.

Parameters:
start - The beginning index, inclusive.
Returns:
The new string.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if start is less than zero, or greater than the length of this object.

subSequence sample code for java.lang.AbstractStringBuilder.subSequence(int, int) definition code for java.lang.AbstractStringBuilder.subSequence(int, int)

public CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence  subSequence(int start,
                                int end)
Returns a new character sequence that is a subsequence of this sequence.

An invocation of this method of the form

 sb.subSequence(begin, end)
behaves in exactly the same way as the invocation
 sb.substring(begin, end)
This method is provided so that this class can implement the CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence interface.

Specified by:
subSequence sample code for java.lang.CharSequence.subSequence(int, int) definition code for java.lang.CharSequence.subSequence(int, int) in interface CharSequence sample code for java.lang.CharSequence definition code for java.lang.CharSequence
Parameters:
start - the start index, inclusive.
end - the end index, exclusive.
Returns:
the specified subsequence.
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - if start or end are negative, if end is greater than length(), or if start is greater than end

substring sample code for java.lang.AbstractStringBuilder.substring(int, int) definition code for java.lang.AbstractStringBuilder.substring(int, int)

public String sample code for java.lang.String definition code for java.lang.String  substring(int start,
                        int end)
Returns a new String that contains a subsequence of characters currently contained in this sequence. The substring begins at the specified start and extends to the character at index end - 1.

Parameters:
start - The beginning index, inclusive.
end - The ending index, exclusive.
Returns:
The new string.
Throws:
StringIndexOutOfBoundsException sample code for java.lang.StringIndexOutOfBoundsException definition code for java.lang.StringIndexOutOfBoundsException - if start or end are negative or greater than length(), or start is greater than end.