Question

I had created a jar file with three classes using this cmd line:

C:\...\db>jar cvf views.jar Line.java Points.java Shapes.java

I can add the jar file to IDE but I can’t import it to the code.

Another thing is the classes in the jar file are xxx.java, but when looking in another jar file i noticed that the classes are xxx.class

I don’t know if that is the problem or not.

Answer 1

Jar is nothing but archiving (zipping)

You are clearly zipping the .java files to your jar file.

First Compile your .java files using javac

than issue your jar command on the generated .class files

Refer How to Create Jar