Question

If I have 2 classes, one being the parent with the following:

public class Parent {
    ...
    public void method1() {
        method2();
    }

    public void method2() {
    }
}

And then in the subclass

public class Child extends Parent {
    ...
    public void method2() {
        ...
    }
}

If I run the following code:

Child c = new Child();
c.method1();

Which version of method2 gets called?

Answer 1

All methods are virtual in Java, which means that it is the Child.method2 that will be called (even if the call is done from the context of Parent).

If the correctness of Parent.method1 relies on the implementation of method2, you should design it differently:

public class Parent {
    ...
    public void method1() {
        method2impl();
    }

    public void method2() {
        method2impl();
    }

    // make it private or final.
    public final method2impl() {
        ...
    }
}