一、IntelliJ IDEA 激活码

下边这个失效了的话，不用急，关注微信公众号：Java团长，发送“ 激活码 ”也可获取最新有效且免费的 idea 激活码。

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二、激活IDEA之后的有效期是99年

1、在idea左侧的项目目录中，您无法看到项目的文件结构图

• 删除项目文件夹下的Idea文件夹
• 使用idea工具重新打开项目

2、idea中出现JDK版本相关问题后的版本检查和切换

Java中不支持菱形运算符等错误：-出现源代码1.5或语言级别“1.6”不支持菱形类型

请先检查以下设置：

文件------项目结构------项目------项目SDK选择1.8，项目语言级别选择8，如图所示：

3、idea创建Maven项目后，主文件夹下的目录不完整

选择“模块”选项卡下的“源”项目，右键单击主文件夹，选择“新建文件夹…”。。。然后单击OK

4、下图底部的红色框中没有内容

确认是否有。项目和。类路径文件

5、您不能部署源代码，您需要部署war包或其他东西