Creating a Non-Byte Java Type Buffer on a ByteBuffer
You can create views on a ByteBuffer to support buffers of
other Java primitive types. For example, by creating a character view
on a ByteBuffer, you treat the ByteBuffer like a buffer of
characters. The character buffer supports strings directly. Also,
hasRemaining() properly works with characters rather than with
bytes.
When you create a typed view, it is important to be aware that
it is created on top of the bytes between position and limit. That
is, the capacity of the new view is (limit – position). The limit of
the new view may be reduced so that the capacity is an integral value
based on the size of the type. Finally, the view shares the same
storage as the underlying ByteBuffer, so any changes to the byte
buffer will be seen by the view and visa versa. However, changes to a
view's position or limit do not affect the ByteBuffer's properties and
visa versa.
// Obtain a ByteBuffer; see also Creating a ByteBuffer ByteBuffer buf = ByteBuffer.allocate(15); // remaining = 15 // Create a character ByteBuffer CharBuffer cbuf = buf.asCharBuffer(); // remaining = 7 // Create a short ByteBuffer ShortBuffer sbuf = buf.asShortBuffer(); // remaining = 7 // Create an integer ByteBuffer IntBuffer ibuf = buf.asIntBuffer(); // remaining = 3 // Create a long ByteBuffer LongBuffer lbuf = buf.asLongBuffer(); // remaining = 1 // Create a float ByteBuffer FloatBuffer fbuf = buf.asFloatBuffer(); // remaining = 3 // Create a double ByteBuffer DoubleBuffer dbuf = buf.asDoubleBuffer(); // remaining = 1
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