【设计模式】软件设计七大原则 ( 依赖倒置原则 | 代码示例 )（二）

package dependenceinversion;
/**
 * 商品接口
 */
public interface IGood {
    /**
     * 购买商品
     */
    void buy();
}

package dependenceinversion;
/**
 * 冰箱商品
 */
public class FridgeGood implements IGood {
    @Override
    public void buy() {
        System.out.println("购买冰箱");
    }
}

package dependenceinversion;
/**
 * 电视商品
 */
public class TelevisionGood implements IGood {
    @Override
    public void buy() {
        System.out.println("购买电视");
    }
}

package dependenceinversion;
public class Main {
    public static void main(String[] args) {
        Customer customer = new Customer();
        customer.buy(new FridgeGood());
        customer.buy(new TelevisionGood());
    }
}

购买冰箱
购买电视

package dependenceinversion;
public class Customer {
    private IGood iGood;
    /**
     * 使用构造函数注入 IGood 实现类
     * @param iGood
     */
    public Customer(IGood iGood) {
        this.iGood = iGood;
    }
    public void buy() {
        this.iGood.buy();
    }
}

package dependenceinversion;
/**
 * 商品接口
 */
public interface IGood {
    /**
     * 购买商品
     */
    void buy();
}

package dependenceinversion;
/**
 * 冰箱商品
 */
public class FridgeGood implements IGood {
    @Override
    public void buy() {
        System.out.println("购买冰箱");
    }
}

package dependenceinversion;
/**
 * 电视商品
 */
public class TelevisionGood implements IGood {
    @Override
    public void buy() {
        System.out.println("购买电视");
    }
}