0. 前言
工欲善其事必先利其器，作为一名Java开发者，手上必须得有趁手的工具。市面上的Java开发IDE有：Eclipse、NetBeans、Lightly、IntelliJ IDEA、JDeveloper 。
作者推荐使用IntelliJ IDEA，为什么推荐它呢？
- 提供了强大的代码编辑功能，包括代码补全、语法高亮、代码重构等。
- 有丰富的插件支持，可以满足各种项目的需求。
- 支持自动化构建、测试和部署，可以提高开发效率。
- 提供了强大的调试工具，可以快速定位和解决问题。
- 支持多版本控制系统，如Git、SVN等
- 可以与其他开发工具（如Maven、Gradle等）无缝集成，方便开发者进行项目管理。
PS:安装IDEA之前需要安装JDK，JDK安装教程
1. 下载IntelliJ IDEA
IntelliJ IDEA支持Windows、macOS、Linux，根据自己的操作系统下载即可。
如果不想下载最新版本的IntelliJ IDEA，也可以下载其他版本。
这里作者就用2022.3.3版本做演示：
点击下载：
2. 安装IntelliJ IDEA
下载后双击安装包
单击next
选择安装路径，作者这里选择C:\APP\Java\IntelliJ IDEA路径
【注意】:路径中尽量不要有中文、空格。
然后一直next即可，完成安装。
3. 激活IntelliJ IDEA
输入激活码
激活码如下：选择对应版本即可。
- 2018.2及以后版本：2018、2019、2020、2021、2022、2023均可使用！
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- 2018.1及以前版本：2016、2017均可使用！
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4. 新建项目
设置项目名、项目存放地址以及JDK版本（由于作者电脑安装了JDK1.8和JDK17所以这里就有两个JDK版本）
运行程序：右键——Run
5. 基础设置
5.1 设置字体大小
file->Settings->Editor->Font
个人建议把字体大小设置为18，显示器最好能看30行代码。
5.2 鼠标滚轮调整字体大小
file->Settings->Editor->Change font size with Ctrl + Mouse Wheel in，勾选Change font size with Ctrl + Mouse Wheel in选项即可。
5.3 忽略文件
file->Settings->Editor->file Tyes ->lgnores and Folders
这里作者添加了*.dea和*iml忽略.idea文件夹和以后缀为.iml的文件
5.4 方法分割线
file->Settings->Editor->General->Appearnce->show method separstors
5.5 询问文件
6. 常用快捷键
| 快捷键组合 | 实现效果 |
| psvm + Tab键 / main + Tab键 | public static void main(String[] args) |
| sout + Tab键 | System.out.println() |
| Ctrl + X | 删除当前行 |
| Ctrl +D | 复制当前行 |
| Alt+Insert(或右键Generate) | 生成代码(如get,set方法,构造函数等) |
| Ctrl+Alt+T | 生成try catch （或者 Alt+enter选择） |
| CTRL+ALT+T | 把选中的代码放在 TRY{} IF{} ELSE{} 里 |
| Ctr+shift+U | 实现大小写之间的转化 |
| ALT+回车 | 导入包,自动修正 |
| CTRL+ALT+L | 格式化代码 |
| CTRL+ALT+I | 自动缩进 |
| CTRL+E | 最近更改的代码 |
| fori | 生成for (int i = 0; i < ; i++) {} |
| Alt + <–左右–>键 | 实现窗口左右更换（多窗口） |
| Ctrl + 鼠标点击 | 快速找到成员变量的出处 |
| Shift+F6 | 重构/重命名 (包、类、方法、变量、甚至注释等) |
| CTRL+Q | 查看当前方法的声明 |
| Ctrl+Alt+V | 自动创建变量（new 对象();之后选择按快捷键） |
| Ctrl+O | 重写方法 |
| Ctrl+I | 实现方法 |
| ALT+/ | 代码提示 |
| Ctrl+Shift+R | 在当前项目中替换指定内容 |
| Ctrl+E | 最近编辑的文件列表 |
| Ctrl+P | 显示方法参数信息 |
| Ctrl+Shift+Insert | 查看历史复制记录，idea可以保留历史复制的 100 条记录 |
7. 插件
- CodeGlance
CodeGlance是一款代码编辑区缩略图插件，可以快速定位代码，使用起来比拖动滚动条方便多了 - 彩虹颜色括号：Rainbow Brackets
- 阿里代码规约检测：Alibaba Java Coding Guidelines
- 汉化插件：chinese（个人建议尽量不要汉化）
最后建议，插件宜少不宜多，选择最适合最需要使用的就行，不必贪多，否则可能会适得其反，IDEA会变得臃肿卡顿，反而影响开发效率。
8. IDEA 调试工具
IDEA 调试方式：首先需要设置断点，然后单击虫子按钮进入 DeBug模式。
| 快捷键 | 操作 |
| F8 | 单步调试（不进入函数内部） |
| F7 | 单步调试（进入函数内部） |
| shift + F7 | 选择要进入的函数 |
| shift + F8 | 跳出函数 |
| alt + F9 | 运行到断点 |
| alt + F8 | 执行表达式查看结果 |
| F9 | 继续执行，进入下一个断点或执行完程序 |
