Thread: Issue with abstract classes

Hi

Maybe I'm missing something here but I can't seem to put abstract classes anywhere but in the same package as the class that extends it.

For example, I create 2 classes like this:

package abstracttest.testpackage2;
 
public abstract class testAbstractClass {
       abstract void testMe();    
}

package abstracttest.testpackage1;
 
import abstracttest.testpackage2.testAbstractClass;
 
public class MainClass extends testAbstractClass {
    @Override
    void testMe() {
        throw new UnsupportedOperationException("Not supported yet.");
    }
}

Looks perfectly valid to me, however, Netbeans reports this error "method does not override or implement a method from a supertype". Why?

If I move the abstract class into the same folder as the mainClass it works! What's this all about?

Found out the answer why from another question in the forums


The problem is the abstract method has to be declared public. All it was I was missing the public declaration....

The problem is the abstract method has to be declared public. All it was I was missing the public declaration....

Or protected. The code posted uses the default package private, which prevents access between packages. See Controlling Access