java集合類——Stack類

查看java的API文檔，Stack繼承Vector類。
棧的特點是后進先出。
API中Stack自身的方法不多，基本跟棧的特點有關。

import?java.util.Stack;??
??
??
public?class?StackTest?{??
??
????public?static?void?main(String[]?args)?{??
????????Stack<String>?stack?=?new?Stack<String>();??
????????System.out.println("now?the?stack?is?"?+?isEmpty(stack));??
????????stack.push("1");??
????????stack.push("2");??
????????stack.push("3");??
????????stack.push("4");??
????????stack.push("5");??
????????System.out.println("now?the?stack?is?"?+?isEmpty(stack));??
????????System.out.println(stack.peek());??
????????System.out.println(stack.pop());??
????????System.out.println(stack.pop());??
????????System.out.println(stack.search("2"));??
????}??
????public?static?String?isEmpty(Stack<String>?stack)?{??
????????return?stack.empty()???"empty"?:?"not?empty";??
????}??
}??

輸出為：

now?the?stack?is empty
now?the?stack?is?not?empty??
5??
5??
4??
2??

可以看出