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Thread: Issue with abstract classes

  1. #1
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    Unhappy 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?


  2. #2
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    Default Re: Issue with abstract classes

    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....



  3. #3
    Administrator copeg's Avatar
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    Default Re: Issue with abstract classes

    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

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    Default Re: Issue with abstract classes

    Please marked it solved , if solved
    Thanks and Regards
    Dan Brown

    Common Java Mistakes

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