java集合类——Stack类

查看java的API文档，Stack继承Vector类。 
栈的特点是后进先出。 
API中Stack自身的方法不多，基本跟栈的特点有关。 

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";
    }
}

输出为： 

now the stack is not empty
5
5
4
2