装饰器模式Decorator

/*** 煎饼果子*/publicinterfaceBetterCake {
StringgetMsg();
intgetPrice();
}

/*** 基础的煎饼果子*/publicclassBaseBetterCakeimplementsBetterCake {
@OverridepublicStringgetMsg() {
return"煎饼";
    }
@OverridepublicintgetPrice() {
return5;
    }
}

/*** 装饰器*/publicclassBatterCakeDecoratorimplementsBetterCake {
privatefinalBetterCakebetterCake;
publicBatterCakeDecorator(BetterCakebetterCake) {
this.betterCake=betterCake;
    }
@OverridepublicStringgetMsg() {
returnthis.betterCake.getMsg();
    }
@OverridepublicintgetPrice() {
returnthis.betterCake.getPrice();
    }
}

/*** 具体装饰器(鸡蛋煎饼果子)*/publicclassEggDecoratorextendsBatterCakeDecorator {
publicEggDecorator(BetterCakebetterCake) {
super(betterCake);
    }
@OverridepublicStringgetMsg() {
returnsuper.getMsg() +"加1个鸡蛋";
    }
@OverridepublicintgetPrice() {
returnsuper.getPrice() +1;
    }
}

/*** 具体装饰器(香肠煎饼果子)*/publicclassSausageDecoratorextendsBatterCakeDecorator {
publicSausageDecorator(BetterCakebetterCake) {
super(betterCake);
    }
@OverridepublicStringgetMsg() {
returnsuper.getMsg() +"加1根香肠";
    }
@OverridepublicintgetPrice() {
returnsuper.getPrice() +2;
    }
}

/*** 煎饼果子测试类*/publicclassBetterCakeTest {
publicstaticvoidmain(String[] args) {
BetterCakebetterCake;
betterCake=newBaseBetterCake();
System.out.println(betterCake.getMsg() +",售价:"+betterCake.getPrice() +"元");
// 煎饼加鸡蛋betterCake=newEggDecorator(betterCake);
System.out.println(betterCake.getMsg() +",售价:"+betterCake.getPrice() +"元");
// 煎饼再加鸡蛋betterCake=newEggDecorator(betterCake);
System.out.println(betterCake.getMsg() +",售价:"+betterCake.getPrice() +"元");
// 煎饼加香肠betterCake=newSausageDecorator(betterCake);
System.out.println(betterCake.getMsg() +",售价:"+betterCake.getPrice() +"元");
    }
}

publicinterfaceCar {
/*** 汽车的驾驶功能*/voidrun();
}

publicclassBmwCarimplementsCar {
@Overridepublicvoidrun() {
System.out.println("宝马开车了。。。");
    }
}

publicclassBenzCarimplementsCar {
@Overridepublicvoidrun() {
System.out.println("奔驰开车了。。。");
    }
}

publicclassTeslaCarimplementsCar {
@Overridepublicvoidrun() {
System.out.println("特斯拉开车了。。。");
    }
}

publicclassCarDecoratorimplementsCar {
protectedCardecorated;
publicCarDecorator(Cardecorated) {
this.decorated=decorated;
    }
@Overridepublicvoidrun() {
decorated.run();
    }
}

publicclassAutoCarDecoratorextendsCarDecorator {
publicAutoCarDecorator(Cardecorated) {
super(decorated);
    }
@Overridepublicvoidrun() {
super.run();
autoRun();
    }
privatevoidautoRun() {
System.out.println("开启自动驾驶");
    }
}

publicclassFlyCarDecoratorextendsCarDecorator {
publicFlyCarDecorator(Cardecorated) {
super(decorated);
    }
@Overridepublicvoidrun() {
super.run();
fly();
    }
privatevoidfly() {
System.out.println("开启飞行汽车模式");
    }
}

publicclassCarTest {
publicstaticvoidmain(String[] args) {
CarbenzCar=newBenzCar();
CarbmwCar=newBmwCar();
CarteslaCar=newTeslaCar();
// 创建自动驾驶的奔驰汽车CarDecoratorautoBenzCar=newAutoCarDecorator(benzCar);
// 创建飞行的、自动驾驶的宝马汽车CarDecoratorflyAutoBmwCar=newFlyCarDecorator(newAutoCarDecorator(bmwCar));
benzCar.run();
bmwCar.run();
teslaCar.run();
System.out.println();
autoBenzCar.run();
System.out.println();
flyAutoBmwCar.run();
    }
}