The reset() method of java.nio.CharBuffer 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 final CharBuffer reset()
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 {
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:
// Java program to demonstrate // reset() 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#reset–