Anonymous Inner Classes Inside Methods

Question

Please have a look at following code :

import java.util.ArrayList;
import java.util.List;

class Main{
     public static  List modifiedLis         


        

Answer 1

Essentially the code is rewritten by the complier as (note I didn't try to compile it..., might have errors):

class Main$1
    extends ArrayList
{
    private final List list;

    Main$1(final List a)
    {
        list = a;
    }

    @Override
    public boolean add(T element)
    {
        super.add(element);
        return list.add(element);
    }
}

and

class Main{
     public static  List modifiedList(final List list)
     {
         return new Main$1(list);
     }

     public static void main(String[] args) 
     {
         List originalList=new ArrayList();
         List duplicateList=modifiedList(originalList);
         originalList.add("1");
         originalList.add("2");
         originalList.add("3");
         System.out.println(originalList+" "+duplicateList);
         duplicateList.add("4");
         duplicateList.add("5");
         duplicateList.add("6");
         System.out.println(originalList+" "+duplicateList);
     }