【转载】Java设计模式---工厂方法模式

转载

1. http://c.biancheng.net/view/1348.html

代码

1. 声明工厂接口

package com.example.study.factory.method.pattern;

public interface AbstractFactory {
    public AbstractProduct create();
}

2. 声明产品接口

package com.example.study.factory.method.pattern;

public interface AbstractProduct {
    // 获取产品名字
    public String getName();
    // 获取产品价格
    public Double getPrice();
}

3. 实现产品1

package com.example.study.factory.method.pattern;

public class Computer implements  AbstractProduct{
    @Override
    public String getName() {
        return "电脑";
    }

    @Override
    public Double getPrice() {
        return 7999.00;
    }
}

4. 实现产品2

package com.example.study.factory.method.pattern;

public class Mouse implements  AbstractProduct{
    @Override
    public String getName() {
        return "鼠标";
    }

    @Override
    public Double getPrice() {
        return 30.00;
    }
}

4. 实现产品1工厂

package com.example.study.factory.method.pattern;

public class ComputerFactory implements  AbstractFactory{
    @Override
    public AbstractProduct create() {
        return new Computer();
    }
}

5. 实现产品2工厂

package com.example.study.factory.method.pattern;

public class MouseFactory implements AbstractFactory{
    @Override
    public AbstractProduct create() {
        return new Mouse();
    }
}

6. 测试

package com.example.study.factory.method.pattern;

import java.lang.reflect.InvocationTargetException;

public class Main {
    public AbstractFactory load(String ClassName) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
         Class factory = Class.forName("com.example.study.factory.method.pattern."+ClassName);
         return (AbstractFactory) factory.getConstructor().newInstance();
    }
    public static void main(String[] args) throws ClassNotFoundException, InvocationTargetException, InstantiationException, IllegalAccessException, NoSuchMethodException {
        Main mainObj = new Main();
        AbstractFactory computerFactory = mainObj.load("ComputerFactory");
        System.out.println(computerFactory.create().getName());
    }
}