DoubleBuffer reset() methods in Java with Examples

Last Updated : 10 Sep, 2019

The reset() method of java.nio.DoubleBuffer Class is used to reset the position of this buffer to a position which was previously-marked. In this, neither a marked value is changed nor discarded. It helps to recover the previously marked value in the buffer.

Syntax:

public final DoubleBuffer reset()

Parameters: The method does not take any parameters.

Return Value: This method returns this buffer.

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

Examples 1:

// Java program to demonstrate 
// reset() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        try { 
  
            double[] darr = { 10.5, 20.5, 30.5, 40.5 }; 
  
            // creating object of DoubleBuffer 
            // and allocating size capacity 
            DoubleBuffer db = DoubleBuffer.wrap(darr); 
  
            // try to set the position at index 2 
            db.position(2); 
  
            // Set this buffer mark position 
            // using mark() method 
            db.mark(); 
  
            // try to set the position at index 4 
            db.position(4); 
  
            // display position 
            System.out.println("position before reset: "
                               + db.position()); 
  
            // try to call reset() to restore 
            // to the position we marked 
            db.reset(); 
  
            // display position 
            System.out.println("position after reset: "
                               + db.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:

// Java program to demonstrate 
// reset() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        try { 
  
            double[] darr = { 10.5, 20.5, 30.5, 40.5 }; 
  
            // creating object of DoubleBuffer 
            // and allocating size capacity 
            DoubleBuffer db = DoubleBuffer.wrap(darr); 
  
            // try to set the position at index 2 
            db.position(2); 
  
            // Set this buffer mark position 
            // using mark() method 
            db.mark(); 
  
            // try to set the position at index 4 
            db.position(1); 
  
            // display position 
            System.out.println("position before reset: "
                               + db.position()); 
  
            // try to call reset() to restore 
            // to the position we marked 
            db.reset(); 
  
            // display position 
            System.out.println("position after reset: "
                               + db.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/DoubleBuffer.html#order–

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