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IntBuffer rewind() method in Java with Examples

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  • Last Updated : 26 Aug, 2019
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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:




// 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());
    }
}


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:




// 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());
    }
}


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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