IntBuffer rewind() method in Java with Examples

The rewind() method of java.nio.IntBuffer Class is used to rewind this buffer. The position is set to zero and the mark is discarded. Invoke this method before a sequence of channel-write or get operations, assuming that the limit has already been set appropriately. Invoking this method neither changes nor discards the mark’s value.

Syntax:

public final IntBuffer rewind()

Parameter: The method do not take any parameter.



Return Value: This method returns this buffer.

Below are the examples to illustrate the rewind() method:

Examples 1:

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// Java program to demonstrate
// rewind() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // defining and allocating IntBuffer
        // using allocate() method
        IntBuffer intBuffer
            = IntBuffer.allocate(4);
  
        // put char value in intBuffer
        // using put() method
        intBuffer.put(10);
        intBuffer.put(20);
  
        // print the int buffer
        System.out.println(
            "Buffer before operation: "
            + Arrays.toString(
                  intBuffer.array())
            + "\nPosition: "
            + intBuffer.position()
            + "\nLimit: "
            + intBuffer.limit());
  
        // rewind the Buffer
        // using rewind() method
        intBuffer.rewind();
  
        // print the intbuffer
        System.out.println(
            "\nBuffer after operation: "
            + Arrays.toString(
                  intBuffer.array())
            + "\nPosition: "
            + intBuffer.position()
            + "\nLimit: "
            + intBuffer.limit());
    }
}

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Output:

Buffer before operation: [10, 20, 0, 0]
Position: 2
Limit: 4

Buffer after operation: [10, 20, 0, 0]
Position: 0
Limit: 4

Examples 2:

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// Java program to demonstrate
// rewind() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
        // defining and allocating IntBuffer
        // using allocate() method
        IntBuffer intBuffer
            = IntBuffer.allocate(5);
  
        // put int value in IntBuffer
        // using put() method
        intBuffer.put(10);
        intBuffer.put(20);
        intBuffer.put(30);
  
        // mark will be going to
        // discarded by rewind()
        intBuffer.mark();
  
        // print the buffer
        System.out.println(
            "Buffer before operation: "
            + Arrays.toString(
                  intBuffer.array())
            + "\nPosition: "
            + intBuffer.position()
            + "\nLimit: "
            + intBuffer.limit());
  
        // Rewind the Buffer
        // using rewind() method
        intBuffer.rewind();
  
        // print the buffer
        System.out.println(
            "\nBuffer after operation: "
            + Arrays.toString(
                  intBuffer.array())
            + "\nPosition: "
            + intBuffer.position()
            + "\nLimit: "
            + intBuffer.limit());
    }
}

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Output:

Buffer before operation: [10, 20, 30, 0, 0]
Position: 3
Limit: 5

Buffer after operation: [10, 20, 30, 0, 0]
Position: 0
Limit: 5

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/IntBuffer.html#rewind–



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