import java.util.Stack; public class Solution { public static void main(String[] args) { Solution s = new Solution(); System.out.println(s.isValid("[]{")); } public boolean isValid(String s) { //栈的特性:先进后出(后进先出 LIFO Last In First Out) 压栈 弹栈 Stack
1:主方法 package com.baidu; import java.text.NumberFormat;import java.util.ArrayList;import java.util.Stack; public class CalculateStack { static private CalculateStack cl = new CalculateStack(); //申明一个存放数字元素的栈 private Stack<String> num = new Stack<