Java Doc for IntBuffer.java in  » 6.0-JDK-Modules » j2me » java » nio » Java Source Code / Java DocumentationJava Source Code and Java Documentation

This class is provided as part of the JSR 239 NIO Buffer building block. It is a subset of the java.nio.IntBuffer class in Java(TM) Standard Edition version 1.4.2. Differences are noted in bold italic. The class documentation may make reference to classes that are not present in the building block.

I/O channels, marking and resetting, and read-only buffers are not supported. Allocation of non-direct int buffers, compaction, and duplication are not supported. The following methods are omitted:

• IntBuffer allocate(int capacity)
• IntBuffer compact()
• IntBuffer duplicate()
• Buffer mark()
• Buffer reset()
• boolean isReadOnly()
• IntBuffer asReadOnlyBuffer()

This class defines four categories of operations upon int buffers:

• Absolute and relative IntBuffer.get() get and IntBuffer.put(int) put methods that read and write single ints;

• Relative IntBuffer.get(int[]) bulk get methods that transfer contiguous sequences of ints from this buffer into an array;

• Relative IntBuffer.put(int[]) bulk put methods that transfer contiguous sequences of ints from an int array or some other int buffer into this buffer; and

• Methods for compacting, duplicating, and IntBuffer.sliceslicing an int buffer. JSR 239 does not support compacting and duplicating buffers.

Int buffers can be created either by allocation, which allocates space for the buffer's content, by IntBuffer.wrap(int[])wrapping an existing int array into a buffer, or by creating a view of an existing byte buffer. JSR 239 supports allocation of ByteBuffers only.

Like a byte buffer, an int buffer is either direct or non-direct. A int buffer created via the wrap methods of this class will be non-direct. An int 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 an int buffer is direct may be determined by invoking the IntBuffer.isDirect isDirect method.

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

Invoke the IntBuffer.hasArray hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.

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

Invoke the IntBuffer.hasArray hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.

Two int buffers are equal if, and only if,

1. They have the same element type,

2. They have the same number of remaining elements, and

3. The two sequences of remaining elements, considered independently of their starting positions, are pointwise equal.

An int buffer is not equal to any other type of object.

This method transfers ints from this buffer into the given destination array.

This method transfers ints from this buffer into the given destination array.

If this method returns true then the IntBuffer.array() array and IntBuffer.arrayOffset() arrayOffset methods may safely be invoked.

The hash code of an int 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.

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

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

This method transfers the ints remaining in the given source buffer into this buffer.

This method transfers ints into this buffer from the given source array.

This method transfers the entire content of the given source int array into this buffer.

The content of the new buffer will start at this buffer's current position.

The new buffer will be backed by the given int array; that is, modifications to the buffer will cause the array to be modified and vice versa.

The new buffer will be backed by the given int array; that is, modifications to the buffer will cause the array to be modified and vice versa.

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

Invoke the IntBuffer.hasArray hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.

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

Invoke the IntBuffer.hasArray hasArray method before invoking this method in order to ensure that this buffer has an accessible backing array.

Two int buffers are compared by comparing their sequences of remaining elements lexicographically, without regard to the starting position of each sequence within its corresponding buffer.

An int buffer is not comparable to any other type of object. A negative integer, zero, or a positive integer as this bufferis less than, equal to, or greater than the given buffer.
throws:
  ClassCastException - If the argument is not an int buffer.

Two int buffers are equal if, and only if,

1. They have the same element type,

2. They have the same number of remaining elements, and

3. The two sequences of remaining elements, considered independently of their starting positions, are pointwise equal.

An int buffer is not equal to any other type of object.

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

Otherwise, this method copies length ints 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(); 

This method transfers ints 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) 

If this method returns true then the IntBuffer.array() array and IntBuffer.arrayOffset() arrayOffset methods may safely be invoked.

The hash code of an int 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.

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

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

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

Otherwise, this method copies n = src.remaining() ints 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()); 

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

Otherwise, this method copies length ints 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]); 

This method transfers the entire content of the given source int 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) 

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. JSR 239 does not support the mark.

The new buffer's position will be zero, its capacity and its limit will be the number of ints 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. JSR 239 does not support the mark or read-only buffers.

The new buffer will be backed by the given int 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 IntBuffer.array backing array will be the given array, and its IntBuffer.arrayOffset array offset will be zero.

The new buffer will be backed by the given int 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 IntBuffer.array backing array will be the given array, and its IntBuffer.arrayOffset array offset will be zero.