How to get bytes from a ByteBuffer : ByteBuffer « File Input Output « Java






  1. Java
  2. File Input Output
  3. ByteBuffer

How to get bytes from a ByteBuffer

 

public class Main{
public static void main(String[] argv) throws Exception{
    // Create an empty ByteBuffer with a 10 byte capacity
    ByteBuffer bbuf = ByteBuffer.allocate(10);
    
    // Retrieve the capacity of the ByteBuffer
    int capacity = bbuf.capacity(); // 10
    
    // The position is not affected by the absolute get() method.
    byte b = bbuf.get(5); // position=0
    
    // Set the position
    bbuf.position(5);
    
    // Use the relative get()
    b = bbuf.get();
    
    // Get the new position
    int pos = bbuf.position(); 
    
    // Get remaining byte count
    int rem = bbuf.remaining();
    
    // Set the limit
    bbuf.limit(7); // remaining=1
    
    // This convenience method sets the position to 0
    bbuf.rewind(); // remaining=7
    
}}








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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.Convert interchangeably between a ByteBuffer and a byte array
44.Create a ByteBuffer
45.Put bytes into a ByteBuffer
46.Write with ByteBuffer
47.Applying Regular Expressions on the Contents of a File