Can an anonymous class implement the non abstract method of the abstract class?

Question

Can an Abstract class non abstract method be overridden by using Anonymous class?. The FindBugs tool is issuing " Uncallable method of anonymous class" issue. Please check the below example for more information

public class BaseClass {
    // This class is a Library Class.
}

public abstract class AbstractBaseClass extends BaseClass {
    public abstract void abstractMethod();
    public void nonAbstractMethod() {}
}

public abstract class DerivedAbstractClass extends AbstractBaseClass {
   // Here Some more additional methods has been added
}

public class DemoAbstract {

    public static void main(String[] args) {
        init();
    }

    private static void init() {
        DerivedAbstractClass derivedAbstractClass = new DerivedAbstractClass() {
            @Override
            public void abstractMethod() {

            }

            @Override
            public void nonAbstractMethod() {
                 // Is it possible to override like this?
            }
        };
    }
}

Answer 1

Yes, this is possible. You can override any non final, non static method