比较二个List，将不同的值做为一个新的List返回

public class ListUtil {  
  
    public static void main(String[] args) {  
        List<String> oldList = new ArrayList<String>();  
        List<String> newList = new ArrayList<String>();  
        oldList.add("diaoer1");  
        oldList.add("diaoer2");  
        oldList.add("diaoer3");  
        oldList.add("diaoer7");  
  
        newList.add("diaoer3");  
        newList.add("diaoer5");  
        newList.add("diaoer1");  
        newList.add("diaoer8");  
        System.out.println(compareTwoList(newList, oldList));  
        System.out.println("--------------------------");  
        System.out.println(compareTwoList(oldList, newList));  
    }  
  
    public static List<String> compareTwoList(List<String> oldList,  
            List<String> newList) {  
        List<String> otherList = new ArrayList<String>();  
        otherList.addAll(newList);  
        otherList.removeAll(oldList);  
        return otherList;  
    }  
  
}