Hi Prasant

The code you needed is given below :

import java.util.*;

class ArrayListTemp {
    ArrayList ALST = new ArrayList();

    ArrayList NLST = new ArrayList();

    ArrayListTemp() {
        ALST.add("One");
        ALST.add("Three");
        ALST.add("Two");
        ALST.add("Four");
        return;
    }

    @SuppressWarnings("unchecked")
    void replace() {
        NLST = ALST;
        ALST = null;
        System.out.println("Elements of First ArrayList are Deleted");
        System.out.println("The First ArrayList Elements are : " + ALST);
        System.out.println("The Second ArrayList Elements are : " + NLST);
    }
}

public class ArrayListDemo {
    public static void main(String[] args) {
        ArrayListTemp AT = new ArrayListTemp();
        AT.replace();

    }

}

The output of the above code should be like this

Elements of First ArrayList are Deleted
The First ArrayList Elements are : null
The Second ArrayList Elements are : [One, Three, Two, Four]