eclipse中自建实体类存在但是导入的包报错cannot be resolved

摘自：https://blog.csdn.net/lazy_p/article/details/7452846 ‘Clean’ Your Eclipse Project: Go to Project > Clean in Eclipse [This seems to work for me] Refresh your project folder (right click on your project > refresh) Re-build your project Clean your builds (If using Ant or Maven – clean your builds) Recreate your project in Eclipse ‘Switch’ Workspace – then Switch back (Eg Change to Debug, then switch back to Java) ‘Switch’ Workspace – then Switch back (Eg Change to Debug, then switch back to Java) Remove and re-add your JRE: 1. Right Click on your project > properties 2. Click on the Libraries tab 3. Click on the JRE 4. Click remove, then OK 5. Repeat 1-3 again, but add the JRE again --------------------- 其中 project 中 clean功能解释如下： 由于eclipse的编译是基于时间戳的判断机制的。因此当你按build   all的时候有些eclipse认为时间戳没有改变的类不会被编译。因此你可以先clean一下再编译。这个时候eclipse会将所有的以前编译信息清除然后编译。   eclipse  --->project  ----->clean... 选项将工程中的.class文件删除，同时重新编译工程，类似于jbuild中的rebuild  --------------------- 本文来自 映月文章 的CSDN 博客 ，全文地址请点击：https://blog.csdn.net/u010715393/article/details/42125505?utm_source=copy