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Mar 6, 2011 · The true reasons for why we need ByteBuffer are two fold: 1) Direct memory access. This means when used in direct mode, ByteBuffer can bypass the JVM garbage collection, and the memory used by ByteBuffer is completely outside the JVM memory pool. 2) Interfacing, as byte [] is primitive and cannot be used in OO way.
Aug 10, 2024 · byte[] bytes = new byte[10];ByteBuffer buffer = ByteBuffer.wrap(bytes); The above code is equivalent to: ByteBuffer buffer = ByteBuffer.wrap(bytes, 0, bytes.length); Any changes made to the data elements in the existing bytearray will be reflected in the buffer instance and vice versa. 2.3.
- Sen Liu
The ByteBuffer class is important because it forms a basis for the use of channels in Java. ByteBuffer class defines six categories of operations upon byte buffers, as stated in the Java 7 documentation: Methods for compacting, duplicating, and slicing a byte buffer. Example code : Putting Bytes into a buffer.
Jan 26, 2013 · byte is generally considered to be 8 bits. short is generally considered to be 16 bits. In a "pure" environment, which isn't java as all implementation of bytes and longs, and shorts, and other fun things is generally hidden from you, byte makes better use of space.
Dec 20, 2012 · The array() method will only work for a byte buffer backed by a byte array (which can be tested with hasArray()) and should generally only be used if you know exactly what you are doing. A common mistake is to use array() to “convert” a ByteBuffer into a byte array.
- Peter Schuller
Methods for compacting, duplicating, and slicing a byte buffer. Byte buffers can be created either by allocation, which allocates space for the buffer's content, or by wrapping an existing byte array into a buffer. Direct vs. non-direct buffers . A byte buffer is either direct or non-direct. Given a direct byte buffer, the Java virtual machine ...
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May 18, 2024 · How to Create a ByteBuffer. First, you must create a ByteBuffer with a given size (“capacity”). There are two methods for this: ByteBuffer.allocate (int capacity) ByteBuffer.allocateDirect (int capacity) The capacity parameter specifies the size of the buffer in bytes. The allocate () method creates the buffer in the Java heap memory, where ...
