How to call methods of different classes passed as parameter type?

Question

How would I do something like this? Ignore the syntax errors.

//some class
class A {
    //some func
    func(){
    
    }
}

class B {
    func2(){
    }
}

//Generic Class that can take type A or B
class generic<T> {
    func3(T){
        //How to do this?
        T.func();
        T.func2();
    }
}

I really don't understand Generics. Sorry if it sounds ridiculous.

Answer 1

You use generic to abstract the "shape" of class you can work on without caring about the actual implementation classes.

You should create a common interface

interface Common {
  void doWork();
}

//some class
class A implements Common {
    void doWork() {
      func();
    }

    //some func
    func(){
    
    }
}

class B implements Common {
    void doWork() {
      func2();
    }

    func2(){
    }
}

//Generic Class that can take type A or B
class generic<T extends Common> {
    func3(T task){
        task.doWork();
    }
}

Answer 2

So pretty much you want to have a class that takes another Util class(or whatever it does) And calls some standard(generic) method on it. What i would do is Create an interface with the method;

public interface ExampleInterface {
   void methodToCall();
}

Then you have your class that takes a implementation of that Interface;

public class OtherExampleClass<T extends ExampleInterface> {
    public void call(T caller){
       caller.methodToCall();
    }
}

For the record, So far this really doesnt need to be genericized at all, I would really only do this if your Class 'A' and 'B' have some specific return type based on which one you provide when instantiated your 'Generic' class.