How can I fix "Cannot resolve symbol" error

[yma16]

Hi,

I put a class file under the classes folder. I do not have the java file for the class. When I use the class in the java file that contains main(), it gave me the "Cannot resolve symbol" error. How can I fix the problem?

Thanks a lot.

[yma16]

after I compiled other java files, I found the classes folder is not the one to hold the class files. The folder is inside out\production folder. But after I put the class with other classes, the error is still there. How can I let IDEA know there is a new class?

[yma16]

The Textpad4 compiled the files ok. It must be IEAD 10's problem.

[RichersooN]

you could use absolute path

[Tolls]

Under the libraries bit of module settings you need to attach classes.
Assuming this is a standalone class you'll need to stick it in a directory of its own, ensuring its location in that directory (that is the directory path) matches its package.
Then attach that folder as a class folder.

It is unusual to import a single class into code, which is why this may sound a long winded way of doing it.