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CharBuffer position() methods in Java with Examples

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  • Last Updated : 28 Jul, 2019
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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-


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