The mark() method of java.nio.IntBuffer Class is used to mark the current position of this IntBuffer as the mark of this buffer.
Syntax:
public final IntBuffer mark()
Parameter: The method do not take any parameter.
Return Value: This method returns this IntBuffer after setting the buffer’s mark at the current position.
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 {
int [] farr = { 10 , 20 , 30 , 40 };
// creating object of IntBuffer
// and allocating size capacity
IntBuffer ib = IntBuffer.wrap(farr);
// try to set the position at index 2
ib.position( 2 );
// Set this buffer mark position
// using mark() method
ib.mark();
// try to set the position at index 4
ib.position( 4 );
// display position
System.out.println( "position before reset: "
+ ib.position());
// try to call reset() to restore
// to the position we marked
ib.reset();
// display position
System.out.println( "position after reset: "
+ ib.position());
}
catch (InvalidMarkException e) {
System.out.println( "New position "
+ "is less than "
+ "the position "
+ "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 {
int [] farr = { 10 , 20 , 30 , 40 };
// creating object of IntBuffer
// and allocating size capacity
IntBuffer ib = IntBuffer.wrap(farr);
// try to set the position at index 2
ib.position( 2 );
// Set this buffer mark position
// using mark() method
ib.mark();
// try to set the position at index 1
ib.position( 1 );
// display position
System.out.println( "position before reset: "
+ ib.position());
// try to call reset() to restore
// to the position we marked
ib.reset();
// display position
System.out.println( "position after reset: "
+ ib.position());
}
catch (InvalidMarkException e) {
System.out.println( "\nNew position "
+ "is less than "
+ "the position "
+ "marked before " );
System.out.println( "Exception throws: "
+ e);
}
}
} |
Output:
position before reset: 1 New position is less than the position marked before Exception throws: java.nio.InvalidMarkException
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/IntBuffer.html#mark–