This below image is my eclipse of my two different projects. And each black rectangle is a package in folder src of Eclipse project. As you know, there a different point: The icon of each package is different.
1) first project: package has normal icon. (like java package)
2) second project: OPPS !!! It displays a folder.

And, the problem that I want to tell is: in project 1, when I type something wrong, eclipse has notice errors. For example: I declare: Example() example = new Example();
But at project 2, Eclipse cannot. That you have seen on my screen: Eclipse eclipse = new Eclipse();
Obvious, when compiled, It failed.
I think that I might do something wrong, and I just a newcomer to Eclipse, and really don’t understand much this IDE.
Please help me for my problem.
thanks so much 🙂
As I think, because you have imported “your package” just by move your source. there are two ways (with my knowledge) that might work:
1) Like Baldrick does.
2) go to Properties\Java Build Path\Projects: add a project that contain package you want to add. this will make two project a linker. when you compile this project, this will also compile project that you link to.