Java tutorial
import java.util.ArrayList; import java.util.List; public class Main { public static void main(String[] argv) throws Exception { List list1 = new ArrayList(); List list2 = new ArrayList(); list1.addAll(list2); list1.removeAll(list2); list1.retainAll(list2); list1.clear(); int newSize = 2; list1.subList(newSize, list1.size()).clear(); } }