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1、int size(); 返回collection 中的元素。
2、boolean is Empty();
3、boolean contains(object obj);
4\boolean contains(collection c);
5、boolean add(object element);
6、boolean addall(collection c);
7、boolean removeAll(object element);
8、boolean removeAll(Collction c);
9、void clear();
10、boolean retainAll(collection c);
11、iterator iterato();
12、object[]toArray();
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原文地址:http://www.cnblogs.com/wzhiq896/p/5491734.html