Java tutorial
//package com.java2s; //License from project: Apache License import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; public class Main { @SuppressWarnings({ "rawtypes", "unchecked" }) public static List removeDuplicateWithOrder(List list) { Set set = new HashSet(); List newList = new ArrayList(); for (Iterator iter = list.iterator(); iter.hasNext();) { Object element = iter.next(); if (set.add(element)) newList.add(element); } return newList; } }