class Decorator{
    public void eat(){
        System.out.println("吃饭");
    }
}
class DecoratorDemo extendspublic DecoratorDemo() {
    }
     DecoratorDemo(Decorator d) {
    }
    /**
     * @param args
     */
    static  main(String[] args) {
        //使用继承来增强功能,体系会很臃肿
        Decorator dd=new DecoratorDemo();
        dd.eat();输出 孩子吃饭
        
        使用装饰器模式增强功能，增强某一个功能
        构造参数传递
        DecoratorDemo dd2=new DecoratorDemo( Decorator());
        dd2.eatFoods();
        
    }
     eat(){
        System.out.println("孩子吃饭");
    }
     eatFoods(){
        System.out.println("孩子吃饭");
    }
}