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Buffer position() methods in Java with Examples

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The position(int newPosition) method of java.nio.Buffer Class is used to set this buffer’s position. If the mark is defined and larger than the new position then it is discarded.

Syntax:

public Buffer position(int newPosition)

Parameters: This method takes the newPosition as parameter which is the new position value. It must be non-negative and no larger than the current limit.

Return Value: This method returns this buffer.

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

Examples 1:




// Java program to demonstrate
// position() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
        byte[] barr = { 10, 20, 30, 40 };
  
        // creating object of ByteBuffer
        // and allocating size capacity
        ByteBuffer bb = ByteBuffer.wrap(barr);
  
        // Typecasting ByteBuffer into Buffer
        Buffer bb1 = (Buffer)bb;
  
        // try to set the position at index 2
        // using position() method
        bb1.position(2);
  
        // Set this buffer mark position
        bb1.mark();
  
        // try to set the position at index 4
        // using position() method
        bb1.position(4);
  
        // display position
        System.out.println("position before reset: "
                           + bb.position());
  
        // try to call reset() to restore
        // to the position we marked
        bb1.reset();
  
        // display position
        System.out.println("position after reset: "
                           + bb1.position());
    }
}


Output:

position before reset: 4
position after reset: 2

Examples 2:




// Java program to demonstrate
// position() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // creating object of ByteBuffer
        // and allocating size capacity
        ByteBuffer bb = ByteBuffer.allocate(4);
  
        // Typecasting ByteBuffer into Buffer
        Buffer bb1 = (Buffer)bb;
  
        // try to set the position at index 1
        // using position() method
        bb1.position(3);
  
        // display position
        System.out.println("position before clear: "
                           + bb1.position());
  
        // try to clear the Buffer
        // using clear() method
        bb1.clear();
  
        // display position
        System.out.println("position after clear: "
                           + bb1.position());
    }
}


Output:

position before clear: 3
position after clear: 0

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#position-int-



Last Updated : 18 Jul, 2019
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