Java设计模式-----Composite模式

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源自：http://www.blogjava.net/flustar/archive/2007/12/18/composite.html

Composite模式：

将对象组合成树形结构以表示“整体—部分”的层次结构。Composite模式使单个对象和组合对象的使用具有一致性。

例子：

public abstract class MovieClass {public String name;public ArrayList<movieclass></movieclass> list;public abstract void add(MovieClass component);public abstract void remove(MovieClass component);public abstract void display();}public class Program extends MovieClass {public Program(String name) {this.name = name;}public void add(MovieClass component) {System.out.println("you can't add component to a proagram object");}public void display() {System.out.println("----------" + name);}public void remove(MovieClass component) {System.out.println("you can't remove component to a proagram object");}}public class ConcreteMovieClass extends MovieClass {public ConcreteMovieClass(String name) {this.name = name;list = new ArrayList<movieclass></movieclass>();}public void add(MovieClass component) {list.add(component);}public void remove(MovieClass component) {if (list.contains(component)) {list.remove(component);}}public void display() {System.out.println(name);for (MovieClass mc : list) {mc.display();}}}public class Client {public static void main(String args[]) {Program pro = new Program("大汉天子");Program pro2 = new Program("贞观长歌");ConcreteMovieClass cmc = new ConcreteMovieClass("电视连续剧");// 一级分类cmc.add(pro);cmc.add(pro2);Program pro3 = new Program("满城尽带黄金甲");Program pro4 = new Program("色戒");ConcreteMovieClass cmc2 = new ConcreteMovieClass("最新影视");// 一级分类cmc2.add(pro3);cmc2.add(pro4);Program pro5 = new Program("越狱");Program pro6 = new Program("英雄");ConcreteMovieClass secondCmc = new ConcreteMovieClass("热播美剧");// 二级分类secondCmc.add(pro5);secondCmc.add(pro6);cmc2.add(secondCmc);// 在一级分类（最新影视)下添加二级分类热播美剧ConcreteMovieClass root = new ConcreteMovieClass("root");root.add(cmc);root.add(cmc2);root.display();// 显示节目列表}}