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java.nio
Class DoubleBuffer

java.lang.Object sample code for java.lang.Object definition code for java.lang.Object 
  extended by java.nio.Buffer sample code for java.nio.Buffer definition code for java.nio.Buffer 
      extended by java.nio.DoubleBuffer
All Implemented Interfaces:
Comparable sample code for java.lang.Comparable definition code for java.lang.Comparable <DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer >
public abstract class DoubleBuffer
extends Buffer sample code for java.nio.Buffer definition code for java.nio.Buffer 
implements Comparable sample code for java.lang.Comparable definition code for java.lang.Comparable <DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer >

A double buffer.

This class defines four categories of operations upon double buffers:

Double buffers can be created either by allocation sample code for java.nio.DoubleBuffer.allocate(int) definition code for java.nio.DoubleBuffer.allocate(int) , which allocates space for the buffer's content, by wrapping sample code for java.nio.DoubleBuffer.wrap(double[]) definition code for java.nio.DoubleBuffer.wrap(double[]) an existing double array into a buffer, or by creating a view of an existing byte buffer

Like a byte buffer, a double buffer is either direct or non-direct. A double buffer created via the wrap methods of this class will be non-direct. A double buffer created as a view of a byte buffer will be direct if, and only if, the byte buffer itself is direct. Whether or not a double buffer is direct may be determined by invoking the isDirect sample code for java.nio.DoubleBuffer.isDirect() definition code for java.nio.DoubleBuffer.isDirect() method.

Methods in this class that do not otherwise have a value to return are specified to return the buffer upon which they are invoked. This allows method invocations to be chained.

Since:
1.4

Method Summary
static DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer allocate sample code for java.nio.DoubleBuffer.allocate(int) definition code for java.nio.DoubleBuffer.allocate(int) (int capacity)
          Allocates a new double buffer.
 double[] array sample code for java.nio.DoubleBuffer.array() definition code for java.nio.DoubleBuffer.array() ()
          Returns the double array that backs this buffer  (optional operation).
 int arrayOffset sample code for java.nio.DoubleBuffer.arrayOffset() definition code for java.nio.DoubleBuffer.arrayOffset() ()
          Returns the offset within this buffer's backing array of the first element of the buffer  (optional operation).
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer asReadOnlyBuffer sample code for java.nio.DoubleBuffer.asReadOnlyBuffer() definition code for java.nio.DoubleBuffer.asReadOnlyBuffer() ()
          Creates a new, read-only double buffer that shares this buffer's content.
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer compact sample code for java.nio.DoubleBuffer.compact() definition code for java.nio.DoubleBuffer.compact() ()
          Compacts this buffer  (optional operation).
 int compareTo sample code for java.nio.DoubleBuffer.compareTo(java.nio.DoubleBuffer) definition code for java.nio.DoubleBuffer.compareTo(java.nio.DoubleBuffer) (DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  that)
          Compares this buffer to another.
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer duplicate sample code for java.nio.DoubleBuffer.duplicate() definition code for java.nio.DoubleBuffer.duplicate() ()
          Creates a new double buffer that shares this buffer's content.
 boolean equals sample code for java.nio.DoubleBuffer.equals(java.lang.Object) definition code for java.nio.DoubleBuffer.equals(java.lang.Object) (Object sample code for java.lang.Object definition code for java.lang.Object  ob)
          Tells whether or not this buffer is equal to another object.
abstract  double get sample code for java.nio.DoubleBuffer.get() definition code for java.nio.DoubleBuffer.get() ()
          Relative get method.
 DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer get sample code for java.nio.DoubleBuffer.get(double[]) definition code for java.nio.DoubleBuffer.get(double[]) (double[] dst)
          Relative bulk get method.
 DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer get sample code for java.nio.DoubleBuffer.get(double[], int, int) definition code for java.nio.DoubleBuffer.get(double[], int, int) (double[] dst, int offset, int length)
          Relative bulk get method.
abstract  double get sample code for java.nio.DoubleBuffer.get(int) definition code for java.nio.DoubleBuffer.get(int) (int index)
          Absolute get method.
 boolean hasArray sample code for java.nio.DoubleBuffer.hasArray() definition code for java.nio.DoubleBuffer.hasArray() ()
          Tells whether or not this buffer is backed by an accessible double array.
 int hashCode sample code for java.nio.DoubleBuffer.hashCode() definition code for java.nio.DoubleBuffer.hashCode() ()
          Returns the current hash code of this buffer.
abstract  boolean isDirect sample code for java.nio.DoubleBuffer.isDirect() definition code for java.nio.DoubleBuffer.isDirect() ()
          Tells whether or not this double buffer is direct.
abstract  ByteOrder sample code for java.nio.ByteOrder definition code for java.nio.ByteOrder order sample code for java.nio.DoubleBuffer.order() definition code for java.nio.DoubleBuffer.order() ()
          Retrieves this buffer's byte order.
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer put sample code for java.nio.DoubleBuffer.put(double) definition code for java.nio.DoubleBuffer.put(double) (double d)
          Relative put method  (optional operation).
 DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer put sample code for java.nio.DoubleBuffer.put(double[]) definition code for java.nio.DoubleBuffer.put(double[]) (double[] src)
          Relative bulk put method  (optional operation).
 DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer put sample code for java.nio.DoubleBuffer.put(double[], int, int) definition code for java.nio.DoubleBuffer.put(double[], int, int) (double[] src, int offset, int length)
          Relative bulk put method  (optional operation).
 DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer put sample code for java.nio.DoubleBuffer.put(java.nio.DoubleBuffer) definition code for java.nio.DoubleBuffer.put(java.nio.DoubleBuffer) (DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  src)
          Relative bulk put method  (optional operation).
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer put sample code for java.nio.DoubleBuffer.put(int, double) definition code for java.nio.DoubleBuffer.put(int, double) (int index, double d)
          Absolute put method  (optional operation).
abstract  DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer slice sample code for java.nio.DoubleBuffer.slice() definition code for java.nio.DoubleBuffer.slice() ()
          Creates a new double buffer whose content is a shared subsequence of this buffer's content.
 String sample code for java.lang.String definition code for java.lang.String toString sample code for java.nio.DoubleBuffer.toString() definition code for java.nio.DoubleBuffer.toString() ()
          Returns a string summarizing the state of this buffer.
static DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer wrap sample code for java.nio.DoubleBuffer.wrap(double[]) definition code for java.nio.DoubleBuffer.wrap(double[]) (double[] array)
          Wraps a double array into a buffer.
static DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer wrap sample code for java.nio.DoubleBuffer.wrap(double[], int, int) definition code for java.nio.DoubleBuffer.wrap(double[], int, int) (double[] array, int offset, int length)
          Wraps a double array into a buffer.
 
Methods inherited from class java.nio.Buffer sample code for java.nio.Buffer definition code for java.nio.Buffer
capacity sample code for java.nio.Buffer.capacity() definition code for java.nio.Buffer.capacity() , clear sample code for java.nio.Buffer.clear() definition code for java.nio.Buffer.clear() , flip sample code for java.nio.Buffer.flip() definition code for java.nio.Buffer.flip() , hasRemaining sample code for java.nio.Buffer.hasRemaining() definition code for java.nio.Buffer.hasRemaining() , isReadOnly sample code for java.nio.Buffer.isReadOnly() definition code for java.nio.Buffer.isReadOnly() , limit sample code for java.nio.Buffer.limit() definition code for java.nio.Buffer.limit() , limit sample code for java.nio.Buffer.limit(int) definition code for java.nio.Buffer.limit(int) , mark sample code for java.nio.Buffer.mark() definition code for java.nio.Buffer.mark() , position sample code for java.nio.Buffer.position() definition code for java.nio.Buffer.position() , position sample code for java.nio.Buffer.position(int) definition code for java.nio.Buffer.position(int) , remaining sample code for java.nio.Buffer.remaining() definition code for java.nio.Buffer.remaining() , reset sample code for java.nio.Buffer.reset() definition code for java.nio.Buffer.reset() , rewind sample code for java.nio.Buffer.rewind() definition code for java.nio.Buffer.rewind()
 
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() , 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() , 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)
 

Method Detail

allocate sample code for java.nio.DoubleBuffer.allocate(int) definition code for java.nio.DoubleBuffer.allocate(int) 

public static DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  allocate(int capacity)
Allocates a new double buffer.

The new buffer's position will be zero, its limit will be its capacity, and its mark will be undefined. It will have a backing array sample code for java.nio.DoubleBuffer.array() definition code for java.nio.DoubleBuffer.array() , and its array offset sample code for java.nio.DoubleBuffer.arrayOffset() definition code for java.nio.DoubleBuffer.arrayOffset() will be zero.

Parameters:
capacity - The new buffer's capacity, in doubles
Returns:
The new double buffer
Throws:
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - If the capacity is a negative integer

wrap sample code for java.nio.DoubleBuffer.wrap(double[], int, int) definition code for java.nio.DoubleBuffer.wrap(double[], int, int) 

public static DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  wrap(double[] array,
                                int offset,
                                int length)
Wraps a double array into a buffer.

The new buffer will be backed by the given double array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity will be array.length, its position will be offset, its limit will be offset + length, and its mark will be undefined. Its backing array sample code for java.nio.DoubleBuffer.array() definition code for java.nio.DoubleBuffer.array() will be the given array, and its array offset sample code for java.nio.DoubleBuffer.arrayOffset() definition code for java.nio.DoubleBuffer.arrayOffset() will be zero.

Parameters:
array - The array that will back the new buffer
offset - The offset of the subarray to be used; must be non-negative and no larger than array.length. The new buffer's position will be set to this value.
length - The length of the subarray to be used; must be non-negative and no larger than array.length - offset. The new buffer's limit will be set to offset + length.
Returns:
The new double buffer
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

wrap sample code for java.nio.DoubleBuffer.wrap(double[]) definition code for java.nio.DoubleBuffer.wrap(double[]) 

public static DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  wrap(double[] array)
Wraps a double array into a buffer.

The new buffer will be backed by the given double array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity and limit will be array.length, its position will be zero, and its mark will be undefined. Its backing array sample code for java.nio.DoubleBuffer.array() definition code for java.nio.DoubleBuffer.array() will be the given array, and its array offset sample code for java.nio.DoubleBuffer.arrayOffset() definition code for java.nio.DoubleBuffer.arrayOffset() will be zero.

Parameters:
array - The array that will back this buffer
Returns:
The new double buffer

slice sample code for java.nio.DoubleBuffer.slice() definition code for java.nio.DoubleBuffer.slice() 

public abstract DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  slice()
Creates a new double buffer whose content is a shared subsequence of this buffer's content.

The content of the new buffer will start at this buffer's current position. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.

The new buffer's position will be zero, its capacity and its limit will be the number of doubles remaining in this buffer, and its mark will be undefined. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.

Returns:
The new double buffer

duplicate sample code for java.nio.DoubleBuffer.duplicate() definition code for java.nio.DoubleBuffer.duplicate() 

public abstract DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  duplicate()
Creates a new double buffer that shares this buffer's content.

The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.

The new buffer's capacity, limit, position, and mark values will be identical to those of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.

Returns:
The new double buffer

asReadOnlyBuffer sample code for java.nio.DoubleBuffer.asReadOnlyBuffer() definition code for java.nio.DoubleBuffer.asReadOnlyBuffer() 

public abstract DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  asReadOnlyBuffer()
Creates a new, read-only double buffer that shares this buffer's content.

The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer; the new buffer itself, however, will be read-only and will not allow the shared content to be modified. The two buffers' position, limit, and mark values will be independent.

The new buffer's capacity, limit, position, and mark values will be identical to those of this buffer.

If this buffer is itself read-only then this method behaves in exactly the same way as the duplicate sample code for java.nio.DoubleBuffer.duplicate() definition code for java.nio.DoubleBuffer.duplicate() method.

Returns:
The new, read-only double buffer

get sample code for java.nio.DoubleBuffer.get() definition code for java.nio.DoubleBuffer.get() 

public abstract double get()
Relative get method. Reads the double at this buffer's current position, and then increments the position.

Returns:
The double at the buffer's current position
Throws:
BufferUnderflowException sample code for java.nio.BufferUnderflowException definition code for java.nio.BufferUnderflowException - If the buffer's current position is not smaller than its limit

put sample code for java.nio.DoubleBuffer.put(double) definition code for java.nio.DoubleBuffer.put(double) 

public abstract DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  put(double d)
Relative put method  (optional operation).

Writes the given double into this buffer at the current position, and then increments the position.

Parameters:
d - The double to be written
Returns:
This buffer
Throws:
BufferOverflowException sample code for java.nio.BufferOverflowException definition code for java.nio.BufferOverflowException - If this buffer's current position is not smaller than its limit
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is read-only

get sample code for java.nio.DoubleBuffer.get(int) definition code for java.nio.DoubleBuffer.get(int) 

public abstract double get(int index)
Absolute get method. Reads the double at the given index.

Parameters:
index - The index from which the double will be read
Returns:
The double at the given index
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit

put sample code for java.nio.DoubleBuffer.put(int, double) definition code for java.nio.DoubleBuffer.put(int, double) 

public abstract DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  put(int index,
                                 double d)
Absolute put method  (optional operation).

Writes the given double into this buffer at the given index.

Parameters:
index - The index at which the double will be written
d - The double value to be written
Returns:
This buffer
Throws:
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - If index is negative or not smaller than the buffer's limit
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is read-only

get sample code for java.nio.DoubleBuffer.get(double[], int, int) definition code for java.nio.DoubleBuffer.get(double[], int, int) 

public DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  get(double[] dst,
                        int offset,
                        int length)
Relative bulk get method.

This method transfers doubles from this buffer into the given destination array. If there are fewer doubles remaining in the buffer than are required to satisfy the request, that is, if length > remaining(), then no doubles are transferred and a BufferUnderflowException sample code for java.nio.BufferUnderflowException definition code for java.nio.BufferUnderflowException is thrown.

Otherwise, this method copies length doubles from this buffer into the given array, starting at the current position of this buffer and at the given offset in the array. The position of this buffer is then incremented by length.

In other words, an invocation of this method of the form src.get(dst, off, len) has exactly the same effect as the loop 

     for (int i = off; i < off + len; i++)
         dst[i] = src.get();
except that it first checks that there are sufficient doubles in this buffer and it is potentially much more efficient.

Parameters:
dst - The array into which doubles are to be written
offset - The offset within the array of the first double to be written; must be non-negative and no larger than dst.length
length - The maximum number of doubles to be written to the given array; must be non-negative and no larger than dst.length - offset
Returns:
This buffer
Throws:
BufferUnderflowException sample code for java.nio.BufferUnderflowException definition code for java.nio.BufferUnderflowException - If there are fewer than length doubles remaining in this buffer
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold

get sample code for java.nio.DoubleBuffer.get(double[]) definition code for java.nio.DoubleBuffer.get(double[]) 

public DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  get(double[] dst)
Relative bulk get method.

This method transfers doubles from this buffer into the given destination array. An invocation of this method of the form src.get(a) behaves in exactly the same way as the invocation 

     src.get(a, 0, a.length)

Returns:
This buffer
Throws:
BufferUnderflowException sample code for java.nio.BufferUnderflowException definition code for java.nio.BufferUnderflowException - If there are fewer than length doubles remaining in this buffer

put sample code for java.nio.DoubleBuffer.put(java.nio.DoubleBuffer) definition code for java.nio.DoubleBuffer.put(java.nio.DoubleBuffer) 

public DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  put(DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  src)
Relative bulk put method  (optional operation).

This method transfers the doubles remaining in the given source buffer into this buffer. If there are more doubles remaining in the source buffer than in this buffer, that is, if src.remaining() > remaining(), then no doubles are transferred and a BufferOverflowException sample code for java.nio.BufferOverflowException definition code for java.nio.BufferOverflowException is thrown.

Otherwise, this method copies n = src.remaining() doubles from the given buffer into this buffer, starting at each buffer's current position. The positions of both buffers are then incremented by n.

In other words, an invocation of this method of the form dst.put(src) has exactly the same effect as the loop 

     while (src.hasRemaining())
         dst.put(src.get());
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.

Parameters:
src - The source buffer from which doubles are to be read; must not be this buffer
Returns:
This buffer
Throws:
BufferOverflowException sample code for java.nio.BufferOverflowException definition code for java.nio.BufferOverflowException - If there is insufficient space in this buffer for the remaining doubles in the source buffer
IllegalArgumentException sample code for java.lang.IllegalArgumentException definition code for java.lang.IllegalArgumentException - If the source buffer is this buffer
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is read-only

put sample code for java.nio.DoubleBuffer.put(double[], int, int) definition code for java.nio.DoubleBuffer.put(double[], int, int) 

public DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  put(double[] src,
                        int offset,
                        int length)
Relative bulk put method  (optional operation).

This method transfers doubles into this buffer from the given source array. If there are more doubles to be copied from the array than remain in this buffer, that is, if length > remaining(), then no doubles are transferred and a BufferOverflowException sample code for java.nio.BufferOverflowException definition code for java.nio.BufferOverflowException is thrown.

Otherwise, this method copies length doubles from the given array into this buffer, starting at the given offset in the array and at the current position of this buffer. The position of this buffer is then incremented by length.

In other words, an invocation of this method of the form dst.put(src, off, len) has exactly the same effect as the loop 

     for (int i = off; i < off + len; i++)
         dst.put(a[i]);
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.

Parameters:
src - The array from which doubles are to be read
offset - The offset within the array of the first double to be read; must be non-negative and no larger than array.length
length - The number of doubles to be read from the given array; must be non-negative and no larger than array.length - offset
Returns:
This buffer
Throws:
BufferOverflowException sample code for java.nio.BufferOverflowException definition code for java.nio.BufferOverflowException - If there is insufficient space in this buffer
IndexOutOfBoundsException sample code for java.lang.IndexOutOfBoundsException definition code for java.lang.IndexOutOfBoundsException - If the preconditions on the offset and length parameters do not hold
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is read-only

put sample code for java.nio.DoubleBuffer.put(double[]) definition code for java.nio.DoubleBuffer.put(double[]) 

public final DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  put(double[] src)
Relative bulk put method  (optional operation).

This method transfers the entire content of the given source double array into this buffer. An invocation of this method of the form dst.put(a) behaves in exactly the same way as the invocation 

     dst.put(a, 0, a.length)

Returns:
This buffer
Throws:
BufferOverflowException sample code for java.nio.BufferOverflowException definition code for java.nio.BufferOverflowException - If there is insufficient space in this buffer
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is read-only

hasArray sample code for java.nio.DoubleBuffer.hasArray() definition code for java.nio.DoubleBuffer.hasArray() 

public final boolean hasArray()
Tells whether or not this buffer is backed by an accessible double array.

If this method returns true then the array sample code for java.nio.DoubleBuffer.array() definition code for java.nio.DoubleBuffer.array() and arrayOffset sample code for java.nio.DoubleBuffer.arrayOffset() definition code for java.nio.DoubleBuffer.arrayOffset() methods may safely be invoked.

Returns:
true if, and only if, this buffer is backed by an array and is not read-only

array sample code for java.nio.DoubleBuffer.array() definition code for java.nio.DoubleBuffer.array() 

public final double[] array()
Returns the double array that backs this buffer  (optional operation).

Modifications to this buffer's content will cause the returned array's content to be modified, and vice versa.

Invoke the hasArray sample code for java.nio.DoubleBuffer.hasArray() definition code for java.nio.DoubleBuffer.hasArray() method before invoking this method in order to ensure that this buffer has an accessible backing array.

Returns:
The array that backs this buffer
Throws:
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is backed by an array but is read-only
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - If this buffer is not backed by an accessible array

arrayOffset sample code for java.nio.DoubleBuffer.arrayOffset() definition code for java.nio.DoubleBuffer.arrayOffset() 

public final int arrayOffset()
Returns the offset within this buffer's backing array of the first element of the buffer  (optional operation).

If this buffer is backed by an array then buffer position p corresponds to array index p + arrayOffset().

Invoke the hasArray sample code for java.nio.DoubleBuffer.hasArray() definition code for java.nio.DoubleBuffer.hasArray() method before invoking this method in order to ensure that this buffer has an accessible backing array.

Returns:
The offset within this buffer's array of the first element of the buffer
Throws:
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is backed by an array but is read-only
UnsupportedOperationException sample code for java.lang.UnsupportedOperationException definition code for java.lang.UnsupportedOperationException - If this buffer is not backed by an accessible array

compact sample code for java.nio.DoubleBuffer.compact() definition code for java.nio.DoubleBuffer.compact() 

public abstract DoubleBuffer sample code for java.nio.DoubleBuffer definition code for java.nio.DoubleBuffer  compact()
Compacts this buffer  (optional operation).

The doubles between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. That is, the double at index p = position() is copied to index zero, the double at index p + 1 is copied to index one, and so forth until the double at index limit() - 1 is copied to index n = limit() - 1 - p. The buffer's position is then set to n+1 and its limit is set to its capacity. The mark, if defined, is discarded.

The buffer's position is set to the number of doubles copied, rather than to zero, so that an invocation of this method can be followed immediately by an invocation of another relative put method.

Returns:
This buffer
Throws:
ReadOnlyBufferException sample code for java.nio.ReadOnlyBufferException definition code for java.nio.ReadOnlyBufferException - If this buffer is read-only

isDirect sample code for java.nio.DoubleBuffer.isDirect() definition code for java.nio.DoubleBuffer.isDirect() 

public abstract boolean isDirect()
Tells whether or not this double buffer is direct.

Returns:
true if, and only if, this buffer is direct

toString sample code for java.nio.DoubleBuffer.toString() definition code for java.nio.DoubleBuffer.toString() 

public String sample code for java.lang.String definition code for java.lang.String  toString()
Returns a string summarizing the state of this buffer.

Overrides:
toString sample code for java.lang.Object.toString() definition code for java.lang.Object.toString() in class Object sample code for java.lang.Object definition code for java.lang.Object
Returns:
A summary string

hashCode sample code for java.nio.DoubleBuffer.hashCode() definition code for java.nio.DoubleBuffer.hashCode() 

public int hashCode()
Returns the current hash code of this buffer.

The hash code of a double buffer depends only upon its remaining elements; that is, upon the elements from position() up to, and including, the element at limit() - 1.

Because buffer hash codes are content-dependent, it is inadvisable to use buffers as keys in hash maps or similar data structures unless it is known that their contents will not change.

Overrides:
hashCode sample code for java.lang.Object.hashCode() definition code for java.lang.Object.hashCode() in class Object sample code for java.lang.Object definition code for java.lang.Object
Returns:
The current hash code of this buffer
See Also:
Object.equals(java.lang.Object)