Question

I have a class with objects
Now i want to call a function from Box and Toy object from outside of the Container class

class Container
{
   Box box1 = new Box();
   Toy toy1 = new Toy();
   public void open()
   {
      box1.open();
   }
   public void play()
   {
      toy1.play();
   }
}

How can i avoid recreating the methods and just sharing the methods with the Container class.
I can not use inheritance because I have 2 or more objects.

Answer 1

You can do it as follows.

public interface ToyInterface {
    public void play();
}

public class Toy implements ToyInterface {
    @Override
    public void play() {
        System.out.println("Play toy");
    }
}

public interface BoxInterface {
    public void open();
}

public class Box implements BoxInterface {
    @Override
    public void open() {
        System.out.println("open box");
    }
}

public class Container implements ToyInterface, BoxInterface {
    private BoxInterface box;
    private ToyInterface toy;

    public Container() {
        box = new Box();
        toy = new Toy();
    }

    public BoxInterface getBox() {
        return box;
    }

    public ToyInterface getToy() {
        return toy;
    }

    @Override
    public void play() {
        System.out.println("play container");
        this.toy.play();
    }

    @Override
    public void open() {
        System.out.println("open container");
        this.box.open();
    }
}

Then you can access methods of Box and Toy class outside of the Container.

Container container = new Container();
container.open();
container.getBox().open();

container.play();
container.getToy().play();