java stack

import java.util.*;

public class AddingGroups {

    public static void main(String[] args) {
        Stack<String> stack = new Stack<String>();
        
        /*不能向stack当中push一个数组
        String[] s = {"Ni","Hao"};
        stack.push(s);*/
         stack.push("hello");
        stack.push("world");
        while(!stack.empty())
        {
            System.out.println(stack.pop());
        }

    }
}