【转】Eclipse “Import cannot be resolved” error

【转】 http://energykey.javaeye.com/blog/296380

The import *** cannot be resolved

搞了半天，遇到这个问题一般是从别的地方直接拷项目或拷源代码，

选择project-->clean后，问题得到解决。此选项的作用：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

如果还不能解决，可以尝试删掉import，然后一个一个的手动导入【alt+/】

http://blog.sherifmansour.com/?p=207

I’m amazed at how many shortcuts or different ways there are of doing things in Eclipse.

Recently I kept hitting an issue of Eclipse not recognising my imports (even though they were there). I was always getting the message:

import ClassName cannot be resolved.

Where ClassName was my imported class. I’m using the MyEclipse Workbench 5.5.1 on Eclipse 3.2. Here are a few tips on how you can fix this (some worked for me, some didn’t):

• ‘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