LongBuffer rewind() method in Java with Examples

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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