组合模式实例

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1、抽象构件类：publicabstractclassMyElement{publicabstractvoideat();}叶子构件类：publicclassAppleextendsMyElement{publicvoideat(){System.out.println("吃苹果！");}}publicclassBananaextendsMyElement{publicvoideat(){System.out.println("吃香蕉！");}}publicclassPearextendsMyElement{public

2、voideat(){System.out.println("吃梨子！");}}容器构件类：publicclassPlateextendsMyElement{privateArrayListlist=newArrayList();publicvoidadd(MyElementelement){list.add(element);}publicvoiddelete(MyElementelement){list.remove(element);}publicvoideat(){for(Objectobject:list){

3、((MyElement)object).eat();}}}容器类：1）定义一个抽象构件类集合，存储其子构件2）提供操作子构件的相关方法，如增加、删除、获取子构件3）实现抽象构件中定义的实现方法，且在该方法的内部递归调用其子构件的实现方法。publicclassClient{publicstaticvoidmain(Stringa[]){MyElementobj1,obj2,obj3,obj4,obj5;Plateplate1,plate2,plate3;obj1=newApple();obj2=newPear();p

4、late1=newPlate();plate1.add(obj1);plate1.add(obj2);obj3=newBanana();obj4=newBanana();plate2=newPlate();plate2.add(obj3);plate2.add(obj4);obj5=newApple();plate3=newPlate();plate3.add(plate1);plate3.add(plate2);plate3.add(obj5);plate3.eat();}}