Question

public class Cls1{
    public foo(){
        doX();
    }
}

public class Cls2{
    public foo(){
        doY();
    }
}

Cls2 cls = new Cls2();
cls.foo();

Is there a way to do inheritance in java that java runs both doX and doY when the user calls the function with foo?

Answer 1

Yes, but you have to do it explicitly:

public class Cls1{
    public foo{
        doX();
    }
}

public class Cls2 extends Cls1 {
    public foo{
        super.foo();
        doY();
    }
}

Note: I assume you meant for Cls2 to extend Cls1, otherwise your question makes no sense at all.