Convert interchangeably between a ByteBuffer and a byte array : ByteBuffer « File Input Output « Java






  1. Java
  2. File Input Output
  3. ByteBuffer

Convert interchangeably between a ByteBuffer and a byte array

 

import java.nio.ByteBuffer;

public class Main {
  public static void main(String[] argv) throws Exception {
    // Create a ByteBuffer from a byte array
    byte[] bytes = new byte[10];
    ByteBuffer buffer = ByteBuffer.wrap(bytes);

    // Retrieve bytes between the position and limit
    bytes = new byte[buffer.remaining()];
    buffer.get(bytes, 0, bytes.length);

    // Retrieve all bytes in the buffer
    buffer.clear();
    bytes = new byte[buffer.capacity()];
    buffer.get(bytes, 0, bytes.length);
  }
}








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4.Create a read-write memory-mapped file
5.Create a private (copy-on-write) memory-mapped file.
6.use FileChannel and ByteBuffer
7.Fast Copy File
8.A ByteBuffer is a fixed-capacity buffer that holds byte values.
9.Create a ByteBuffer using a byte array
10.Create a non-direct ByteBuffer with a 10 byte capacity
11.Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.
12.Get the ByteBuffer's capacity
13.Use the absolute get().
14.Set the position
15.Use the relative get()
16.Get remaining byte count in a ByteBuffer
17.Set the limit for ByteBuffer
18.This convenience method sets the position to 0
19.Putting Bytes into a ByteBuffer
20.Converting Between a ByteBuffer an a Byte Array
21.Retrieve bytes between the position and limit
22.Retrieve all bytes in the buffer
23.Get and Set char type data in a ByteBuffer
24.Get and Set short type data in a ByteBuffer
25.Get and Set int type data in a ByteBuffer
26.Get and Set long type data in a ByteBuffer
27.Get and Set float type data in a ByteBuffer
28.Get and Set double type data in a ByteBuffer
29.Create a character ByteBuffer
30.Create a short ByteBuffer
31.Create an integer ByteBuffer
32.Create a long ByteBuffer
33.Create a float ByteBuffer
34.Create a double ByteBuffer
35.Get a substring
36.Using a ByteBuffer to Store Strings
37.Get default byte ordering
38.Put a multibyte value
39.Set to little endian
40.Determining If a ByteBuffer Is Direct
41.Reading from a Channel with a ByteBuffer
42.Writing and Appending a ByteBuffer to a File
43.Create a ByteBuffer
44.Put bytes into a ByteBuffer
45.How to get bytes from a ByteBuffer
46.Write with ByteBuffer
47.Applying Regular Expressions on the Contents of a File