Java tutorial
//package com.java2s; import java.util.ArrayList; import java.util.HashSet; public class Main { @SuppressWarnings({ "unchecked", "rawtypes" }) public static void removeDuplicate(ArrayList arlList) { HashSet h = new HashSet(arlList); arlList.clear(); arlList.addAll(h); } @SuppressWarnings({ "unchecked", "rawtypes" }) public static ArrayList removeDuplicate(ArrayList arlList, ArrayList list) { for (Object object : list) { if (!arlList.contains(object)) { arlList.add(object); } } return arlList; } }