Creating a ByteBuffer
A ByteBuffer is a fixed-capacity buffer that holds byte values.
This example demonstrates a number of ways to create a ByteBuffer.
See also Getting Bytes from a ByteBuffer and
Putting Bytes into a ByteBuffer.
// Create a ByteBuffer using a byte array
byte[] bytes = new byte[10];
ByteBuffer buf = ByteBuffer.wrap(bytes);
// Create a non-direct ByteBuffer with a 10 byte capacity
// The underlying storage is a byte array.
buf = ByteBuffer.allocate(10);
// Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.
buf = ByteBuffer.allocateDirect(10);
// To create a ByteBuffer for a memory-mapped file,
// see Creating a Memory-Mapped File
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