求助各位大佬,这样的问题怎样解决?

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
TreeSet cannot be resolved to a type
Peroson cannot be resolved to a type
TreeSet cannot be resolved to a type
Peroson cannot be resolved to a type

图片说明

还有一个问题是:文件可以运行,但是class为什么会显示×

查看全部
m0_46585205
m0_46585205
2020/03/18 11:04
  • java
  • eclipse
  • 点赞
  • 收藏
  • 回答
    私信

3个回复