How to change value of ArrayList element in java

Question

Please help me with below code , I get the same output even after changing the value

import java.util.*;

class Test {
    public static void main(String[] a         


        

Answer 1

I agree with Duncan ...I have tried it with mutable object but still get the same problem... I got a simple solution to this... use ListIterator instead Iterator and use set method of ListIterator

ListIterator i = a.listIterator();
//changed the value of first element in List
Integer x =null;
        if(i.hasNext()) {
            x = i.next();
            x = Integer.valueOf(9);
        }
    //set method sets the recent iterated element in ArrayList
    i.set(x);
        //initialized the iterator again and print all the elements
        i = a.listIterator();
        while(i.hasNext())
        System.out.print(i.next());

But this constraints me to use this only for ArrayList only which can use ListIterator...i will have same problem with any other Collection