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public interface FruitFactory {
    // ????
    public abstract Fruit createApple();
    // ????
    public abstract Fruit createBanana();
}

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public class NorthFactory implements FruitFactory {
    @Override
    public Fruit createApple() {
        return new NorthApple();
    }
    
    @Override
    public Fruit createBanana() {
        return new NorthBanana();
    }
}

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public abstract class Fruit {
    public abstract void collect();
}
public class NorthApple extends Fruit {
    @Override
    public void collect() {
        System.out.println("??????");
    }
}
public class NorthBanana extends Fruit {
    @Override
    public void collect() {
        System.out.println("??????");
    }
}

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???????????????????????????????????TropicalFactory????????createApple?createBanana???????????????????????????????????-?????

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