IntBuffer clear() method in Java with Examples

The clear() method of java.nio.IntBuffer Class is used to clear this buffer. While clearing this buffer following changes are done:

• the position is set to zero
• the limit is set to the capacity
• the mark is discarded.

Syntax:

public final IntBuffer clear()

Parameter: The method do not take any parameter.

Return Value: This method returns this IntBuffer instance after clearing all the data from it.

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

Examples 1:

// Java program to demonstrate
// clear() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        try {

            int[] iarr = { 10, 20, 30, 40 };

            // creating object of IntBuffer
            // and allocating size capacity
            IntBuffer ib
                = IntBuffer.wrap(iarr);

            // 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 clear() to restore
            // to the position at index 0
            // by discarding the mark
            ib.clear();

            // display position
            System.out.println("position after reset: "
                               + ib.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: 0

Examples 2:

// Java program to demonstrate
// clear() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        int[] iarr = { 10, 20, 30, 40 };

        // creating object of IntBuffer
        // and allocating size capacity
        IntBuffer ib = IntBuffer.wrap(iarr);

        // try to set the position at index 3
        ib.position(3);

        // display position
        System.out.println("position before clear: "
                           + ib.position());

        // try to call clear() to restore
        // to the position at index 0
        // by discarding the mark
        ib.clear();

        // display position
        System.out.println("position after clear: "
                           + ib.position());
    }
}

Output:

position before clear: 3
position after clear: 0

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/IntBuffer.html#rewind–