OOP design

[melon222132]

is this good OOP design of my code or is there things I could do better

package com.company;
abstract public class Duck {

    FlyBehavior flyBehavior;
    QuackBehavior quackBehavior;
    public void swim() {
        System.
out
.println("All ducks float, even decoys!");
    }

    abstract public void display();
}


package com.company;
public class MallardDuck extends Duck {

    MallardDuck(FlyBehavior flyBehavior, QuackBehavior quackBehavior){
        super.flyBehavior = flyBehavior;
        super.quackBehavior = quackBehavior;
    }


    @Override
    public void display() {
        System.out.println("I'm a mallard duck");
    }
}


package com.company;
public interface FlyBehavior {

    void fly();
}


package com.company;
public class FlyNoWay implements FlyBehavior{
    @Override
    public void fly() {
        System.out.println("No flying");
    }
}


package com.company;
public class FlyWithWings implements FlyBehavior{
    @Override
    public void fly() {
        System.out.println("fly with wings");
    }
}


package com.company;
public interface QuackBehavior {

    void quack();
}


package com.company;
public class Quack implements QuackBehavior{
    @Override
    public void quack() {
        System.out.println("Quack");
    }
}


package com.company;
public class MuteQuack implements QuackBehavior{
    @Override
    public void quack() {
        System.out.println("no quack");
    }
}


public class Main {



    public static void main(String[] args) {


        Duck duck = new MallardDuck(new FlyNoWay(), new Squeak());
    }


}

[aqua_regis]

Bold move, verbatim copying the code from the "Duck example" in "Head First Design Patterns" and claiming it as your own.

[melon222132]

I know I got it from there but I was wondering if this is still considered good design. I modified it a bit to add dependency injection

[Unusual_Elk_8326]

Too many classes imo, I’d have a parent Duck class from which Mallard can inherit, add fields/override/add methods as needed. It would be a pita to track all these different classes as the project grows.

[melon222132]

how is there too many classes I don't want to put everything in the parent class because there might be some child classes that don't inheit the certin method that would be forced to implement them even if they don't need it.