1. 创建 Java 项目后新建 Class，出现报错：The project was not built...
fig-1. The project was not built...
👌 解决方法：单击项目名称，Properties - Java Build Path - Libraries 下点击 JRE System Library, 选择 JRE-1.1
2. 继承 JFrame 时报错：The type 'JFrame' is not API...
fig-2. The type 'JFrame' is not API...
👌 解决方法：修改eclipse的错误级别设置,
Windows -> Preferences -> Java -> Compiler -> Errors/Warnings -> Deprecated and restricted API -> Forbidden reference (access rules): -> 改为 warning
⚠️ 只是将报错改为warning，可能仍存在问题
👌 解决方法：右键点击 JRE System Library... - Build Path - Configure Build Path
选择 JRE System Library[OSGI]... ，选择 remove 进行移除
点选右边的 Add Library，双击第一个 JRE System Library，默认 Finish
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