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–
