When a piece of code needs error handling, IntelliJ underlines it with red. Set your pointer on that piece of code and press ALT+ENTER. IntelliJ should now give you the choice to either surround it with try/catch, add a catch clause, or to add a thro…

1, Touch build.gradle in root project folder, and use plugins: apply plugin: 'idea' apply plugin: 'java' 2, and execute command line: gradle cleanIdea 3, and after that: gradle idea Done!…

前几节都是基础中的基础,从第三讲的笔记开始,每次笔记针对Java的一个知识块儿.  Java异常处理 1.什么是异常? 异常是指运行期出的错误.比如说:除以一个0:数组越界:读取的文件不存在. 异常处理,要把异常控制在程序员合理范围之内.如数组越界indexOutOfArray,在用户看来是不可以被理解的,所以,程序员要捕获这种异常,反馈到前端告诉用户是“超出了范围”. Java中针对异常事件,自动生成一个异常对象.这个异常对象封装了异常事件的信息并将其提交给Java运行时系统.Java运行时系…

1.Scanner类 1)使用 a.导入Scanner类 improt java.util.Scanner; b.创建Scanner对象 Scanner input = new Scanner(System.in); c.获取输入数据 int now = input.nextInt(); 2)方法 a.String next() 获取字符串 b.Int nextInt() 获取整形数值 c.Double nextDouble() 获取双精度浮点数 d.boolean hasNext() 有输入返…

前面介绍的几种异常(不包含错误),编码的时候没认真看还发现不了,直到程序运行到特定的代码跑不下去了,程序员才会恍然大悟:原来这里的代码逻辑有问题.像这些在运行的时候才暴露出来的异常,又被称作“运行时异常”,与之相对的另一类异常叫做“非运行时异常”.所谓非运行时异常,指的是在编码阶段就被编译器发现这里存在潜在的风险,需要开发者关注并加以处理.比如把某个字符串转换成日期类型,用到了SimpleDateFormat实例的parse方法,倘若按照常规方式编码,则编译器会在parse这行提示代码错误,并给…

201871010106-丁宣元 <面向对象程序设计(java)>第九周学习总结 正文开头: 项目 内容 这个作业属于哪个课程 https://home.cnblogs.com/u/nwnu-daizh/ 这个作业的要求在哪里 https://www.cnblogs.com/nwnu-daizh/p/11778090.html 作业学习目标 (1) 掌握java异常处理技术: (2) 了解断言的用法: (3) 了解日志的用途: (4) 掌握程序基础调试技巧: 正文内容: 第一部分:总结第七章理…

Add a syscall to kernel and replace linux kernel of RPi. Prepare: Cross compiler Linux Kernel for RPi Reference: Official guide Firstly, get the latest kernel: git clone https://github.com/raspberrypi/linux Assume that the kernel directory is 'linux'…

Enhancing the Application: Advanced JDBC Features This chapter describes additional functionality that you can use in your Java application. Some of these features have not been implemented in the sample application, while some features are enhanceme…

In this tutorial we will discuss about different types of questions that can be used in a Java interview, in order for the employer to test your skills in Java and object-oriented programming in general. In the following sections we will discuss abou…

创建一个web工程 导入jar 配置web.xml 在web.xml配置前端控制器:DispatcherServlet <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" x…