包中无法识别Java类

Question

My friend and I are using GitHub to collaborate on a project, and I just downloaded a package he had. He wrote it in NetBeans and I'm using it in Eclipse. Four of the classes in the package have the regular icon, a white page with a blue J. But three others have a white page, but there's an outline of a blue J instead of a filled J. The four regular classes all expand into class and then method/property trees, but the three odd classes don't expand at all in the Package Explorer. When I try to reference one of the odd classes in a regular one, ie

List<Reminder> list = new ArrayList<Reminder>();

It puts a red underline under the class Reminder and when I hover over it with my cursor, it tells me to add an import statement, but when I click on where it says that it doesn't add the import statement. When I try to type in the import statement myself, ie

import MobiTech.PlaceSaver.Reminder;

It says the import can not be resolved. The syntax used for declaring the class seems to be correct:

public class Reminder
{
public Location location;
public String message;
//Reminder radius in meters
double radius = 1.0;

public Reminder()
{
}
public Reminder(Location l, String m)
{
    message = m;
    location = l;
}

public Reminder(Location l, String m, int r)
{
    message = m;
    location = l;
    radius = r;
}

I don't see what's going on, any ideas?

Answer 1

You should take a look at this . It seems the "outline of the blue J" is the second one on that list, which means that Java file is not on a build path. Follow this guide to add them to your project's build path.

Edit: or this one, that one's nice and simple. Go down to "2. Adding existing files to the project".

Edit 2: As the OP said in the comment below, to add the existing code to the project, right click on it (the package or directory) in the package explorer, then select "Build Path -> Include".

Answer 2

I know this is an old question, but I just had a very similar problem. I came across this forum post: http://www.eclipse.org/forums/index.php/t/88625/ .

As the post suggested I clicked Project->Clean, and all the unresolved type errors disappeared.

Answer 3

same happens for me here. It turns out just when the class was not built in the bin folder. Check your bin or target folder. ~