场景适用设计模式

1.工厂方法模式

当一个类新建时，需要依赖很多其他类时，如：创建汽车类时，需要先组装轮子，椅子，方向盘等等。

interface IFactory {
    public ICar createCar();
}
class Factory implements IFactory {
    public ICar createCar() {
        Engine engine = new Engine();
        Underpan underpan = new Underpan();
        Wheel wheel = new Wheel();
        ICar car = new Car(underpan, wheel, engine);
        return car;
    }
}
public class Client {
    public static void main(String[] args) {
        IFactory factory = new Factory();
        ICar car = factory.createCar();
        car.show();
    }
}