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老师哪里写错了吗
老师我有个疑问为什么有时候我无论对节点做什么操作，控制台都会报异常说找不到该节点，但再运行一次又行了呢？
一、问题：判断一个字符串的对称性。
老师，为啥我输出的会是false，感觉逻辑没有问题，而且代码跟老师讲课一样，但为什么输出的不是true。
二、代码
package com.bjsxt; import java.util.Stack; public class StackTest { public static void main(String[] args) { System.out.println("-------判断字符串的对称性---------"); StackTest stackTest = new StackTest(); stackTest.symmetry(); } //判断字符串的对成型 public void symmetry(){ String str="...{.....[....(....)...]....}..(....)..[...]..."; Stack<String> stack = new Stack<>(); boolean flag = true;//假设是匹配的 for (int i=0;i<str.length();i++){ char c = str.charAt(i); //拆分字符，把字符拿出来 if (c=='{'){ stack.push("}"); } if (c=='['){ stack.push("]"); } if (c=='('){ stack.push(")"); } if (c == '）'|| c == ']'|| c == '}'){ //修正处理 if (stack.empty()){ flag = false; break; } String x = stack.pop(); //修正处理 if (x.charAt(0) != c){ flag = false; break; } } } if (!stack.empty()){ flag = false; } System.out.println(flag); } }
三、运行效果图
if __name__ == '__main__': a1 = Account(100, "高淇") lock1 = Lock() draw1 = Drawing(80,a1) draw2 = Drawing(80,a1) draw1.start() draw2.start()
蓝莓派_project.zip
老师后台数据穿不来 前台也有问题
b=9.583 c=round(b) print(b) g=9.5 h=round(g) print(g)
老师为啥我这两串代码不是四舍五入的？该多少还是多少啊，咋回事？
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和视频里老师写的代码还是有点区别的，不过效果基本上都达到了
老师，我在pom里加jdbc的依赖了，还是爆红
/** * 需求： * 产生 1-10 之间的随机数([1,10]闭区间)，将不重复的 10 个随机数放到容器中。 */ public class ListDame { public static void main(String[] args) { Stack<Integer> list= new Stack<>(); while(true){ int num=(int) (Math.random()*10); if (!list.contains(num)){ list.push(num); } if (list.size()==10){ break; } } for (int i=0;i<list.size();i++){ System.out.print(list.pop()+"\t"); } System.out.println(); System.out.println(list); } }
为什么这样调用list。pop() 出栈不完全？
/* 输出 2 0 1 3 9 [6, 7, 8, 5, 4] Process finished with exit code 0 */
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>自定义右键菜单案例</title> <style> ul{width: 200px;background: #f8f8f8;border: 1px solid #cccc;list-style: none;padding: 0;display: none;position: absolute;} ul li{height: 30px;line-height: 30px;font-size: 14px;padding-left: 10px;cursor: pointer;} ul li:hover{background-color: teal;} </style> </head> <body> <textarea cols="30" rows="10"></textarea> <ul> <li>你是谁?</li> <li>你确定要离开本页面吗？</li> <li>选中的内容跳转到百度搜索</li> <li>输入的内容跳转到百度搜索</li> </ul> <script> //系统右键菜单禁用事件【contextmenu】 document.oncontextmenu = function (eve) { return false; //return false表示事件禁用 }; //鼠标右键点击任意位置显示右键菜单 var ul = document.querySelector('ul'); document.onmouseup = function(eve){ //eve.button可以判断用的是鼠标的哪一个按钮 //左键是0，滚轮是1，右键是2 //console.log(eve.button); if(eve.button == 2){ //设置鼠标点击的位置 //记住记住记住，必须给‘px’ ul.style.left = eve.clientX + 'px'; ul.style.top = eve.clientY + 'px'; ul.style.display = 'block'; }else{ ul.style.display = 'none'; } } //采用事件委托，点击每一个选项时触发的事件 ul.onclick = function(eve){ if(eve.target.innerHTML == '你是谁?'){ alert('我是我') }else if(eve.target.innerHTML == '你确定要离开本页面吗？'){ //判断点击的是确定还是取消 if(confirm(eve.target.innerHTML == '你确定要离开本页面吗？')){ window.close(); } }else if(eve.target.innerHTML == '选中的内容跳转到百度搜索'){ var result = document.getSelection().toString();//getSelection()获取选中的内容,然后转成字符串就可以搜索了 window.open('http://www.baidu.com/s?wd=' + result); }else{ var result1 = prompt('搜索什么'); window.open('http://wwww.baidu.com/s?wd=' + result1); } } </script> </body> </html>
老师，我的第三个只能跳到百度，不能直接选中搜索
这里的resourceServerConfig和iaas中的resourceServerConfig有什么不同？为什么配置两个，还是说这两个只需要一个就可以？
mongo是怎么根据什么确定要插入那个集合的，实体类也没有添加映射方面的注解
是不是需要在application配置文件中配置点什么？要不然这儿的thymeleaf下面是红的，页面也显示不出来
idea2017创建动态web工程少了选项不会自动创建.xml文件咋办?
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哪里错了照着敲一直报错按着视频上一样桥的代码
和视频里老师写的代码还是有点区别的，不过效果基本上都达到了
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