LongBuffer rewind() method in Java with Examples

Last Updated : 28 Aug, 2019

The rewind() method of java.nio.LongBuffer Class is used to rewind this buffer. By rewinding this Buffer, the following actions are taken:

Current position is set to zero
the mark is discarded, if any, but the mark value is unchanged.

Syntax:

public LongBuffer rewind()

Parameter: This method do not accept any parameter.

Return Value: This method returns this buffer after rewinding.

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 LongBuffer
        // using allocate() method
        LongBuffer longBuffer = LongBuffer.allocate(4);
  
        // put long value in longBuffer
        // using put() method
        longBuffer.put(10);
        longBuffer.put(20);
  
        // print the long buffer
        System.out.println(
            "Buffer before operation: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.limit());
  
        // rewind the Buffer
        // using rewind() method
        longBuffer.rewind();
  
        // print the longbuffer
        System.out.println(
            "\nBuffer after operation: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.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 LongBuffer
        // using allocate() method
        LongBuffer longBuffer
            = LongBuffer.allocate(5);
  
        // put long value in longBuffer
        // using put() method
        longBuffer.put(10);
        longBuffer.put(20);
        longBuffer.put(30);
  
        // mark will be going to
        // discarded by rewind()
        longBuffer.mark();
  
        // print the buffer
        System.out.println(
            "Buffer before operation: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.limit());
  
        // Rewind the Buffer
        // using rewind() method
        longBuffer.rewind();
  
        // print the buffer
        System.out.println(
            "\nBuffer after operation: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.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/LongBuffer.html#mark–

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