CharBuffer mark() methods in Java with Examples

Last Updated : 23 Jul, 2019

The mark() method of java.nio.CharBuffer Class is used to set this buffer’s mark at its position.

Syntax:

public CharBuffer mark()

Return Value: This method returns this buffer.

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

Examples 1:

// Java program to demonstrate 
// mark() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        try { 
  
            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 
            cb.position(2); 
  
            // Set this buffer mark position 
            // using mark() method 
            cb.mark(); 
  
            // try to set the position at index 4 
            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()); 
        } 
  
        catch (InvalidMarkException e) { 
            System.out.println("new position is less than "
                               + "the position we marked before "); 
            System.out.println("Exception throws: " + e); 
        } 
    } 
} 

Output:

position before reset: 4
position after reset: 2

Examples 2: To demonstrate InvalidMarkException

// Java program to demonstrate 
// mark() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        try { 
  
            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 
            cb.position(2); 
  
            // Set this buffer mark position 
            // using mark() method 
            cb.mark(); 
  
            // try to set the position at index 4 
            cb.position(1); 
  
            // 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()); 
        } 
  
        catch (InvalidMarkException e) { 
            System.out.println("\nnew position is less than "
                               + "the position we marked before "); 
            System.out.println("Exception throws: " + e); 
        } 
    } 
} 

Output:

position before reset: 1

new position is less than the position we marked before 
Exception throws: java.nio.InvalidMarkException

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#mark–

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