Java Collection - 如何设置在列表上操作：addAll，removeAll，retainAll，subList

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();
  }
}