Question

I found this code at a search on Google:

public interface Combine {
    // Combines 2 objects
    public Object combine(Object o1, Object o2);
}

and I would like to combine two objects in the main class using the above code. How would I declare a Combine object to serve my purpose?

Answer 1

You would create a class that implements the Combine interface, and override public Object combine(Object o1, Object o2) to do whatever it means in your case to combine those two parameters.

class Droplet implements Combine { 

    @Override
    public Object combine(Object dropOne, Object dropTwo) {

        //write combine code for droplets and return a newly combined droplet

    }

}

Look at Marcelos answer for a fancier solution using generics – this allows you to pass in the specific types you’re interested in, and not just Object.