Updated Code

InterfaceAndOtherClasses.java

public interface Reaction {
     void click();
     void hover();
}
public class Haha implements Reaction {
    public void onClick() {
            System.out.println("Show Haha emoji");
    }
    public void onHover() {
            System.out.println("Haha");
    }
}
public class Like implements Reaction {
    public void onClick() {
        System.out.println("Show Like emoji");
    }
    public void onHover() {
        System.out.println("Like");
    }
}
public class Main {
    public static void main(String[] args) {
        Reaction reaction = new LikeButton();
        reaction.click(); //shows like emoji
        reaction = new HahaButton();
        reaction.click(); //shows haha emoji
    }
}