CharBuffer position() methods in Java with Examples

The position(int newPosition) method of java.nio.CharBuffer 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 CharBuffer 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)
    {
        char[] carr = { 'a', 'b', 'c', 'd' };

        // creating object of CharBuffer
        // and allocating size capacity
        CharBuffer cb = CharBuffer.wrap(carr);

        // try to set the position at index 2
        // using position() method
        cb.position(2);

        // Set this buffer mark position
        cb.mark();

        // try to set the position at index 4
        // using position() method
        cb.position(4);

        // display position
        System.out.println("position before reset: "
                           + cb.position());

        // try to call reset() to restore
        // to the position we marked
        cb.reset();

        // display position
        System.out.println("position after reset: "
                           + cb.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 CharBuffer
        // and allocating size capacity
        CharBuffer cb = CharBuffer.allocate(4);

        // try to set the position at index 1
        // using position() method
        cb.position(1);

        // putting the value of CharBuffer
        // using append() method
        cb.append('x');

        // try to set the position at index 3
        // using position() method
        cb.position(3);

        // putting the value of CharBuffer
        // using append() method
        cb.append("y");

        // display position
        System.out.println("CharBuffer: "
                           + Arrays.toString(cb.array()));
    }
}

Output:

CharBuffer: [,  x,,  y]

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