Using abstract class that implements an interface (Java)

Question

I have this interface,

public interface IAnything {
  void m1();
  void m3();
}

And two abstract classes implementing this interface:

public abstract class AbstractThing1 implements IAnything {
  public void m1() {}
  public void m3() {}
}

public abstract class AbstractThing2 implements IAnything {
  public void m1() {}
  public void m3() {}
}

Somewhere in my code I want to call a function doSomething(kindOfAbstractClass) that perfoms m1() and m3(), among other jobs depending on kindOfAbstractClass.

How can I define and call doSomething()? I did this but it is not working. Thanks

private <T extends IAnything> void doSomething(T kindOfAbstractClass) {
...
kindOfAbstractClass.m1();
kindOfAbstractClass.m3();
...
}

doSomething(AbstractThing1.class);

Answer 1

Your problem is that you are supplying a class type rather than an instance as parameter to doSomething

Take a look at modified code below:

public class MyClass {


    void doIt(){
        doSomething(new ConcreteThing());       
    }

    private <T extends IAnything> void doSomething(T kindOfAbstractClass) {

            kindOfAbstractClass.m1();
            kindOfAbstractClass.m3();
    }

}


interface IAnything {
      void m1();
      void m3();
}

abstract class AbstractThing1 implements IAnything {
      public void m1() {}
      public void m3() {}
}


class ConcreteThing extends AbstractThing1{

}

Answer 2

Try this:

private void doSomething(IAnything  kindOfAbstractClass) {
...
kindOfAbstractClass.m1();
kindOfAbstractClass.m3();
...
}