Factory Method -对象创建模型

最新推荐文章于 2025-05-07 15:01:34 发布

原创最新推荐文章于 2025-05-07 15:01:34 发布 · 218 阅读

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本文深入探讨了工厂方法设计模式的概念，通过定义一个用于对象创建的接口，让子类决定实例化哪个类，实现类的实例化延迟。文章通过具体代码示例展示了Creator、Product等参与对象的结构和实现细节。

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1.意图
定义一个用于对象创建的接口，让子类决定实例化哪个类，Factory Method
使一个类的实例化延迟到其子类。
2.参与对象
Product,ConcreteProduct,Creator,ConcreteCreator
3.结构

代码：

public interface Creator {
   public Product getProduct(); 
}

public interface Product {
   void play();
}

public class ConcreteCreatorA implements Creator {
	private final static ConcreteCreatorA concreteCreatorA = new ConcreteCreatorA();
    private ConcreteCreatorA(){
    	
    }
	public static Creator getConcreteCreatorA(){
    	return concreteCreatorA;
    }
	@Override
	public Product getProduct() {
		return new ConcreteProductA();
	}

}

public class ConcreteCreatorB implements Creator {
	private final static ConcreteCreatorB concreteCreatorB = new ConcreteCreatorB();
    private ConcreteCreatorB(){
    	
    }
	public static Creator getConcreteCreatorB(){
    	return concreteCreatorB;
    }
	@Override
	public Product getProduct() {
		return new ConcreteProductB();
	}

}

public class ConcreteProductA implements Product {

	@Override
	public void play() {
		System.out.println("A.play");
	}

}

public class ConcreteProductB implements Product {

	@Override
	public void play() {
		System.out.println("B.play");
		
	}

}

public class Client {
	public static void main(String[] args) {
         Creator creator = ConcreteCreatorB.getConcreteCreatorB();
         Product  product  =creator.getProduct();
         product.play();
	}
}