CODEWITHSUNDEEP
javamethodsinterfacethisimplementation
Dillon Burton
Dillon Burton

Reputation: 363

Calling another classes method with the object of the class

Class A implements interface I that requires method doAction(). If I call a method from class A of class B, and pass "this"(class A) into that method, how can I call a method that lives in class A from the method in class B? For example:

class A implements I {
    public void start() {
        B.myMethod(this);
    }

    @Override
    public void doAction() {
        // Do stuff...
    }
}

Class B {
    public void myMehtod(Class theClass) { //How would I accept 'this', and...
        theClass.doAction(); //How would I call the method?
    }
}

I am doing this for purposes of a custom library, without knowing the exact name of the class that extends I.

Upvotes: 0

Views: 65

Answers (1)

Antimony
Antimony

Reputation: 39451

This is a very basic question about how interfaces work. I'd recommend trying to find a tutorial about them.

Anyway, all you have to do is declare a parameter with the interface as its type. You can invoke interface methods on variables of the interface type (or any sub interface or class that implements that interface).

Class B {
    public void myMethod(I theClass) {
        theClass.doAction();
    }
}

Upvotes: 4

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