每天上班都要跑很远,既要走公路,又要爬山。不过现在我有一辆小车,可以在公路上跑。我还有一个飞行器,可以翻山。嘿,如果我高兴我还可以用飞行器吊着小车跑(当然我的小车重量是可以忽略的,要不我直接用飞行器不就行了吗,之所以这样我想它即是汽车也是飞行器,两者的功能可以同时发挥)。
看看我的设计吧:
这是装饰者和被装饰这共同的接口(也就是说我,飞行器,小汽车说到底可以看成是同一类东西)
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装饰者接口
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飞行器:
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小汽车
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这就是我了。
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客户代码:
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运行结果:
Decorator.ManA
Car run
aerocraft run
注意:ManA 是被装饰者(被包在里面了哦),汽车和飞行器是装饰者。装饰者的作用就是扩展被装饰者(当然还可以是装饰者,上面的Aerocraft就装饰了Car)的能力。本来我不具备汽车跑的能力。也不具备飞行器飞的能力。但是我们都是Component啊。既然是同宗,你能就是我能嘛。而且这种能力能层层借用哦。
Component a = new Aerocraft(new Car(new ManA()));//和下面的这个是一样的
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我来了也(Component a1 = new ManA();),坐到汽车里面了也(new Car(a1)),变汽车了也(a1 = new Car(a1);)
看飞机来了也,汽车到飞机里去了也,汽车变飞机了也,飞机飞走了也。