【收录】自动驾驶芯片入门-2、国内外主流厂商介绍

设计模式（结构型设计模式——装饰者模式）

装饰者模式

基本定义

模式结构

代码实现

Component：抽象构件, 被装饰抽象类

public interface Cake {
    String nameDetail();
    Double price();
}

ConcreteComponent: 抽象实现类，被装饰对象类

public class CakeImpl implements Cake {
    /**
     * 手抓饼配料->鸡蛋，牛肉，蔬菜,
     * 组合方式：1.鸡蛋，2.牛肉，3.蔬菜，4. 鸡蛋+牛肉，5. 鸡蛋+蔬菜，6.牛肉＋蔬菜, 7.鸡蛋+牛肉+蔬菜
     */
    public String nameDetail() {
        return "原味手抓饼";
    }
    public Double price() {
        return 5d;
    }
}

Decorator: 抽象装饰类

public class CakeDecorator implements Cake{
    Cake cake;
    //装饰实现类
    public CakeDecorator(Cake cake) {
        this.cake = cake;
    }
    public String nameDetail() {
        return cake.nameDetail();
    }
    public Double price() {
        return cake.price();
    }
}

ConcreteDecorator: Decorator具体实现类

鸡蛋手抓饼 +1.5元

public class EggCakeDecorator extends CakeDecorator{
    public EggCakeDecorator(Cake cake) {
        super(cake);
    }
    //关键部分
    @Override
    public String nameDetail() {
        return "鸡蛋，" + cake.nameDetail();
    }
    @Override
    public Double price() {
        return 1.5 + cake.price();
    }
}

牛肉手抓饼 +2元

public class MeetCakeDecorator extends CakeDecorator{

    public MeetCakeDecorator(Cake cake) {
        super(cake);
    }

    //关键部分
    @Override
    public String nameDetail() {
        return "牛肉，" + cake.nameDetail();
    }
    @Override
    public Double price() {
        return 2 + cake.price();
    }
}

蔬菜手抓饼 +0.5元

public class VeggCakeDecorator extends CakeDecorator{

    public VeggCakeDecorator(Cake cake) {
        super(cake);
    }

    //关键部分

    @Override
    public String nameDetail() {
        return "蔬菜，" + cake.nameDetail();
    }

    @Override
    public Double price() {
        return 0.5 + cake.price();
    }
}

测试类

@Slf4j
public class Test {

    public static void main(String[] args) {
        Cake cake = new CakeImpl();
        log.info("小红想吃{}, 价格：￥{}", cake.nameDetail(), cake.price());

        CakeDecorator cakeEgg = new EggCakeDecorator(cake);
        log.info("小明想吃{}, 价格：￥{}", cakeEgg.nameDetail(), cakeEgg.price());

        CakeDecorator meetCake = new MeetCakeDecorator(cakeEgg);
        CakeDecorator veggCake = new VeggCakeDecorator(meetCake);
        log.info("小张想吃{}, 价格：￥{}", veggCake.nameDetail(), veggCake.price());
    }
}

优点

缺点

使用场景