The reset() method of java.nio.Buffer Class is used to reset this buffer’s position to the previously-marked position. Invoking this method neither changes nor discards the mark’s value.
Syntax:
public Buffer reset()
Return Value: This method returns this buffer.
Below are the examples to illustrate the reset() method:
Examples 1:
Java
// Java program to demonstrate// reset() methodimport java.nio.*;import java.util.*;public class GFG { public static void main(String[] args) { try { byte[] barr = { 10, 20, 30, 40 }; // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.wrap(barr); // Typecast ByteBuffer to buffer Buffer buffer = (Buffer)bb; // try to set the position at index 2 buffer.position(2); // Set this buffer mark position // using mark() method buffer.mark(); // try to set the position at index 4 buffer.position(4); // display position System.out.println("position before reset: " + buffer.position()); // try to call reset() to restore // to the position we marked buffer.reset(); // display position System.out.println("position after reset: " + buffer.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
// Java program to demonstrate// reset() methodimport java.nio.*;import java.util.*;public class GFG { public static void main(String[] args) { try { byte[] barr = { 10, 20, 30, 40 }; // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.wrap(barr); // Typecast ByteBuffer to buffer Buffer buffer = (Buffer)bb; // try to set the position at index 2 buffer.position(2); // Set this buffer mark position // using mark() method buffer.mark(); // try to set the position at index 4 buffer.position(1); // display position System.out.println("position before reset: " + buffer.position()); // try to call reset() to restore // to the position we marked buffer.reset(); // display position System.out.println("position after reset: " + buffer.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: 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/Buffer.html#reset–
