在水果盘(Plate)中有一些水果,如苹果(Apple)、香蕉(Banana)、梨子(Pear),当然大水果盘中还可以有小水果盘,现需要对盘中的水果进行遍历(吃),当然如果对一个水果盘执行“吃”方法,实际上就是吃其中的水果。使用( 1 )模式模拟该场景。 public abstract class 2 { public abstract void eat(); } public class Pear extends MyElement { public void eat() { System.out.println(" 吃梨子! "); } } public class Banana extends MyElement { public void eat() { System.out.println(" 吃香蕉! "); } } public class Apple extends MyElement { public void eat() { System.out.println(" 吃苹果! "); } } import java.util.*; public class Plate extends MyElement { private ArrayList list=new ArrayList(); public void add( 3 ) { list.add(element); } public void delete(MyElement element) { 4 ; } public void eat() { for(Object object:list) { 5 ; } } } public class Client { public static void main(String a[]) { MyElement obj1,obj2,obj3,obj4,obj5; Plate plate1,plate2,plate3; obj1=new Apple(); obj2=new Pear(); plate1=new Plate(); plate1.add(obj1); plate1.add(obj2); obj3=new Banana(); obj4=new Banana(); plate2=new Plate(); plate2.add(obj3); plate2.add(obj4); obj5=new Apple(); plate3=new Plate(); plate3.add(plate1); plate3.add(plate2); plate3.add(obj5); plate3.eat(); } }