Collection接口实现类的特点及常用方法

 1 public class CollectionMethod {
 2     public static void main(String[] args) {
 3         List list = new ArrayList();
 4         //添加元素
 5         list.add("jack");
 6         list.add(123);
 7         list.add(true);
 8         System.out.println("list = " + list);
 9         //删除元素
10         list.remove(0);
11         list.remove(true);
12         System.out.println("list = " + list);
13         //contains:包含
14         System.out.println(list.contains(true));
15         //size:显示个数
16         System.out.println(list.size());
17         //isEmpty:是否为空
18         System.out.println(list.isEmpty());
19         //addall:添加多个元素
20         ArrayList list2 = new ArrayList();
21         list2.add("红楼梦");
22         list2.add("三国演义");
23         list.addAll(list2);
24         System.out.println("list = " + list);
25         //containsAll:是否包含多个元素
26         System.out.println(list.containsAll(list2));
27         //removeAll:删除多个元素
28         list.removeAll(list2);
29         System.out.println("list = " + list);
30         //clear:清空
31         list.clear();
32         System.out.println(list);
33     }
34 }