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I need a byte buffer class in Java for single-threaded use. The buffer should resize when it's full, rather than throw an exception or something. Very important issue for me is performance.
What would you recommend?
ADDED: At the momement I use ByteBuffer but it cannot resize. I need one that can resize.
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ByteBuffer holds a sequence of integer values to be used in an I/O operation. The ByteBuffer class provides the following four categories of operations upon long buffers: Absolute and relative get method that read single bytes. Absolute and relative put methods that write single bytes.
Then, how can we create a direct buffer? A direct ByteBuffer is created by calling the allocateDirect() method with the desired capacity: ByteBuffer buffer = ByteBuffer. allocateDirect(10);
A ByteBuffer is a buffer which provides for transferring bytes from a source to a destination. In addition to storage like a buffer array, it also provides abstractions such as current position, limit, capacity, etc. A FileChannel is used for transferring data to and from a file to a ByteBuffer.
Any reason not to use the boring normal ByteArrayOutputStream?
As mentioned by miku above, Evan Jones gives a review of different types and shows that it is very application dependent. So without knowing further details it is hard to speculate.
I would start with ByteArrayOutputStream, and only if profiling shows it is your performance bottleneck move to something else. Often when you believe the buffer code is the bottleneck, it will actually be network or other IO - wait until profiling shows you need an optimisation before wasting time finding a replacement.
If you are moving to something else, then other factors you will need to think about:
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