工厂模式

public interface Factory {
    public LeiFeng CreateLeiFeng();
}

public class LeiFeng {
    public void sweep() {
        System.out.println("sweep");
    }

    public void wash() {
        System.out.println("wash");
    }

    public void buyRice() {
        System.out.println("buy rice");
    }
}

/**
 * Created by tian on 16-5-29.
 * <p>
 * 定义一个用于创建对象的接口，让子类决定实例化哪一个对象。工厂方法使一个类的实例化延迟到其子类
 * 工厂方法模式实现时，客户端需要决定实例化哪一个工厂来实现运算类，选择判断的问题还是存在的，
 * 也就是说，工厂方法把简单工厂的内部逻辑判断移到了客户端代码来进行。想要增加新功能，原来是修改工厂类，
 * 现在是修改客户端。
 */
public class Main {
    public static void main(String[] args) {
        //简单工厂模式
        LeiFeng studentA = SimpleFactory.CreateLeiFeng("xuesehng");
        LeiFeng zhiyuanzhe = SimpleFactory.CreateLeiFeng("zhiyuanzhe");
        //工厂模式
        Factory factory = new UnderGraduateFactory();
        LeiFeng xuesheng = factory.CreateLeiFeng();
    }
}

/**
 * Created by tian on 16-5-29.
 * //简单工厂的实现方法
 */
public class SimpleFactory {
    public static LeiFeng CreateLeiFeng(String type){
        LeiFeng leiFeng = null;
        switch (type){
            case "xuesheng":
                leiFeng = new UnderGraduate();
                break;
            case "zhiyuanzhe":
                leiFeng = new Volunteer();
        }
        return leiFeng;
    }
}

public class UnderGraduate extends LeiFeng{

}

public class UnderGraduateFactory implements Factory {
    @Override
    public LeiFeng CreateLeiFeng() {
        return new UnderGraduate();
    }
}

public class Volunteer extends LeiFeng {
}

public class VolunterFactory implements Factory{

    @Override
    public LeiFeng CreateLeiFeng() {
        return new Volunteer();
    }
}