Rahul

import java.util.ArrayList;import java.util.List;class Main{	public static <T> List<T> modifiedList(final List<T> list){		return new ArrayList<T>(){			private List<T> originalList=list;			@Override			public boolean add(T element){				super.add(element);				return originalList.add(element);			}		};	}	public static void main(String[] args) {		List<String> originalList=new ArrayList<String>();		List<String> 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);			}}