Question

If in an abstract base class, there is a public/private method m1 and an abstract method m2, how can I make the method m1 to be executed before the implemented method m2 in the subclass. (Basically I’m trying to put some basic validations in m1)

Answer 1

Something like this:

public abstract class Base {
    public boolean m1() {
        // validation stuff
    }
    public final void m2() {
        if (m1()) {
            m2Imp();
        }
    }
    protected abstract void m2Imp();
}