Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
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- Basic Usage - Creating a ByteBuffer
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Java Language ByteBuffer Basic Usage - Creating a ByteBuffer
Example
There's two ways to create a ByteBuffer, where one can be subdivided again.
If you have an already existing byte[], you can "wrap" it into a ByteBuffer to simplify processing:
byte[] reqBuffer = new byte[BUFFER_SIZE];
int readBytes = socketInputStream.read(reqBuffer);
final ByteBuffer reqBufferWrapper = ByteBuffer.wrap(reqBuffer);
This would be a possibility for code that handles low-level networking interactions
If you do not have an already existing byte[], you can create a ByteBuffer over an array that's specifically allocated for the buffer like this:
final ByteBuffer respBuffer = ByteBuffer.allocate(RESPONSE_BUFFER_SIZE);
putResponseData(respBuffer);
socketOutputStream.write(respBuffer.array());
If the code-path is extremely performance critical and you need direct system memory access, the ByteBuffer can even allocate direct buffers using #allocateDirect()
