Java-Stack

package 集合类.list类;  

import java.util.Date;
import java.util.Stack;  

/**
 * stack类继承与vector类
 * @author jjj
 *
 */
public class Stack类 {
      public static void main(String[] args) {  

          Stack s = new Stack();  

          s.push("hello");  

          s.push(new Date());  

          s.push(400);  // 自动封装 , 等价于 s.push(new Integer(400));  

          s.push(3.14);  

          System.out.println(" 弹栈前 :size=" + s.size());  

          System.out.println(s.pop());  

          System.out.println(" 弹栈后 :size=" + s.size());  

          System.out.println(s.peek());  

          System.out.println("peek 操作后 :size=" + s.size());  

          while(!s.isEmpty())  

                 System.out.println(s.pop());  

   }
}