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Java 工厂方法模式

程序员文章站 2024-01-05 23:39:34
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定义:定义一个创建对象的接口,让子类决定实例化哪一个类。
抽象产品类:

public abstract class Product {
    public abstract void detail();
}

具体产品类:

public class Car extends Product {
    @Override
    public void detail() {
        System.out.println("汽车");
    }
}
public class Plane extends Product {
    @Override
    public void detail() {
        System.out.println("飞机");
    }
}

抽象工厂类:

public abstract class Creator {
    public abstract <T extends Product> T createProduct(Class<T> clazz);
}

具体工厂类:

public class CreatorImpl extends Creator {
    @Override
    public <T extends Product> T createProduct(Class<T> clazz) {
        Product product = null;
        try {
            product = (Product) Class.forName(clazz.getName()).newInstance();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return (T) product;
    }
}

实例:

public class Client {
    public static void main(String[] args) {
        Creator creator = new CreatorImpl();
        Product product = creator.createProduct(Car.class);
        product.detail();
        product = creator.createProduct(Plane.class);
        product.detail();
    }
}

简单工厂模式:(去抽象类、静态方法)

public class SimpleFactory {
    public static  <T extends Product> T createProduct(Class<T> clazz) {
        Product product = null;
        try {
            product = (Product) Class.forName(clazz.getName()).newInstance();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return (T) product;
    }
}
相关标签: java 设计模式