老师，这个返回值类型为什么写Vehicle啊？
我下载成功了为什么会这样
C:\Users\lenovo>java -version
java version "1.8.0_311"
Java(TM) SE Runtime Environment (build 1.8.0_311-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.311-b11, mixed mode)
C:\Users\lenovo>
老师我的是java version "1.8.0_311"这样是不是不对
Java的三大版本和每半年更新的版本是什么关系，都说版本有点搞不清
老师，你说在其他的方法中不能try-catch，这样会让OpenSQLSessionInViewFilter捕获不到异常，那我想捕获道异常后跳转到一个异常界面是不是到filter界面的catch下用
servletRequest.getRequestDispatcher
方法
StringBuilder在哪里有讲啊，我怎么不记得了
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <link rel="stylesheet" href="./iconfont.css"> <style> *{ margin: 0; padding: 0; } body{ background-color: #f1f1f1; } .slide{ width: 234px; height: 420px; background-color: rgba(105,101,101,0.6); padding: 20px 0; margin: 100px; position: relative; } .slide ul{ list-style: none; } .slide ul li{ width: 100%; height: 42px; line-height: 42px; text-align: left; padding-left: 30px; box-sizing: border-box; } .slide ul li:hover{ background-color: #ff6700; } .slide ul li a{ display: inline-block; text-decoration: none; color: #fff; } .slide .iconfont{ display: inline-block; font-size: 24px; color: #fff; position: absolute; right: 10px; } .slide-list{ width: 992px; height: 460px; background-color: #fff; position: absolute; top: 0; left: 234px; border: 1px solid #e0e0e0; border-left:none ; box-sizing: border-box; box-shadow: 0 4px 16px rgba(0,0,0,0.18); display: none; overflow: hidden; clear: both; } /* 鼠标滑动到li标签上，对应的div出现 */ .slide ul li:hover>.slide-list{ display: block; } .slide-list .text{ display: block; width: 208px; height: 70px; line-height: 70px; /* background-color: red; */ float: left; margin-left: 30px; margin-top: 7px; font-size:normal; } .slide-list .text:hover>i{ color: #ff6700; } .slide-list .text img{ display: inline-block; /* 垂直对齐方式 */ vertical-align: middle; } .slide-list .text i{ font-size:normal; display: inline-block; color:black; font-size: 16px; } </style> </head> <body> <div class="slide"> <ul> <li> <a href="#">手机</a> <span class="iconfont icon-jiantou"></span> <div class="slide-list"> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" > <i>Redmi K50 Pro</i> </a> <a class="text" href="#"> <img src="./Xiaomi 12X.webp" alt=""> <i>Xiaomi 12X</i> </a> <a class="text" href="#"> <img src="./Xiaomi Civi.webp" alt=""> <i>Xiaomi Civi</i> </a> <a class="text" href="#"> <img src="./Xiaomi 10S.webp" alt=""> <i>Xiaomi 10S</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" alt=""> <i>Redmi K50</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" > <i>Redmi K50 Pro</i> </a> <a class="text" href="#"> <img src="./Xiaomi 12X.webp" alt=""> <i>Xiaomi 12X</i> </a> <a class="text" href="#"> <img src="./Xiaomi Civi.webp" alt=""> <i>Xiaomi Civi</i> </a> <a class="text" href="#"> <img src="./Xiaomi 10S.webp" alt=""> <i>Xiaomi 10S</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" alt=""> <i>Redmi K50</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" > <i>Redmi K50 Pro</i> </a> <a class="text" href="#"> <img src="./Xiaomi 12X.webp" alt=""> <i>Xiaomi 12X</i> </a> <a class="text" href="#"> <img src="./Xiaomi Civi.webp" alt=""> <i>Xiaomi Civi</i> </a> <a class="text" href="#"> <img src="./Xiaomi 10S.webp" alt=""> <i>Xiaomi 10S</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" alt=""> <i>Redmi K50</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" > <i>Redmi K50 Pro</i> </a> <a class="text" href="#"> <img src="./Xiaomi 12X.webp" alt=""> <i>Xiaomi 12X</i> </a> <a class="text" href="#"> <img src="./Xiaomi Civi.webp" alt=""> <i>Xiaomi Civi</i> </a> <a class="text" href="#"> <img src="./Xiaomi 10S.webp" alt=""> <i>Xiaomi 10S</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" alt=""> <i>Redmi K50</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" > <i>Redmi K50 Pro</i> </a> <a class="text" href="#"> <img src="./Xiaomi 12X.webp" alt=""> <i>Xiaomi 12X</i> </a> <a class="text" href="#"> <img src="./Xiaomi Civi.webp" alt=""> <i>Xiaomi Civi</i> </a> <a class="text" href="#"> <img src="./Xiaomi 10S.webp" alt=""> <i>Xiaomi 10S</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" alt=""> <i>Redmi K50</i> </a> <a class="text" href="#"> <img src="./Redmi K50 Pro.webp" > <i>Redmi K50 Pro</i> </a> <a class="text" href="#"> <img src="./Xiaomi 12X.webp" alt=""> <i>Xiaomi 12X</i> </a> <a class="text" href="#"> <img src="./Xiaomi Civi.webp" alt=""> <i>Xiaomi Civi</i> </a> <a class="text" href="#"> <img src="./Xiaomi 10S.webp" alt=""> <i>Xiaomi 10S</i> </a> </div> </li> <li> <a href="#">电视</a> <span class="iconfont icon-jiantou"></span> <div class="slide-list">小米2</div> </li> </ul> </div> </body> </html>
为什么这个字体我设置的normal但是还是斜体
老师，为什么下载的文档里没有初始的文件啊，都是已经完成了的项目，有初始化的文件吗
package 平常练习.银行取款系统模拟; class Account{ private int id; private double money; public Account(int id, double money) { this.id = id; this.money = money; } public int getId() { return id; } public void setId(int id) { this.id = id; } public double getMoney() { return money; } public void setMoney(double money) { this.money = money; } } class drawmoney extends Thread{ private Account accout; private double money; private int id; private String name; public drawmoney(double money, int id, String name) { super(name); this.money = money; this.id = id; } @Override public void run() { if (this.money<=this.accout.getMoney()){ System.out.println(name+"成功取出了"+money+"元，账户余额为："+(accout.getMoney()-money)); accout.setMoney(accout.getMoney()-money); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } }else { System.out.println("您的输入有误，请核对账户和金额重新输入。"); } } } public class Bank { public static void main(String[] args) { Account account=new Account(123456,10000); drawmoney drawmoney = new drawmoney(8000,123456,"爸爸"); drawmoney drawmoney2 = new drawmoney(8000,123456,"妈妈"); drawmoney.start(); drawmoney2.start(); } }
老师，这个代码为什么会报空指针异常呢？
老师 我Docker安装报错
更换数据源的目的是以便访问国外网站速度快点嘛
老师你好，当我打x和y都是0时，为什么是“y轴”，而不是“原点”呢？
老师为什么父类的rest方法，要放到这个类的study方法里才行呢
老师，如果不加super（name）会对结果有什么影响吗
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