软件设计模式-中介者模式
使用中介者模式来说明联合国的作用,要求绘制相应的类图并分析每个类的作用(注:可以将联合国定义为抽象中介者类,联合国下属机构如WIO，WHO，WTO等作为具体者类,国家作为抽象同事类,而将中国,美国等国家作为具体同事类).
类图：
代码：
import java.util.Hashtable;public class Pro {public static void main(String[] args) {Country china, japan, us;china = new China();japan = new Japan();us = new America();Group wto, who, wio;wto = new WTO();wio = new WIO();who = new WHO();wto.register(china);wto.register(japan);who.register(china);who.register(us);wio.register(china);wio.register(japan);wio.register(us);china.sendTextByWHO(us.getCountryName(), "川普可安好");china.sendTextByWHO(japan.getCountryName(), "^_^");us.sendTextByWTO(china.getCountryName(), "不好");us.sendTextByWIO(china.getCountryName(), "no");}}class Country {protected String countryName;private Group wto, who, wio;public Country(String name) {this.countryName = name;}public void sendTextByWTO(String to, String msg) {if (wto != null) {wto.sendText(countryName, to, msg);} else {System.out.println(countryName "未加入wto, 不能通过该组织发送消息");}}public void sendTextByWHO(String to, String msg) {if (who != null) {who.sendText(countryName, to, msg);} else {System.out.println(countryName "未加入who, 不能通过该组织发送消息");}}public void sendTextByWIO(String to, String msg) {if (wio != null) {wio.sendText(countryName, to, msg);} else {System.out.println(countryName "未加入wio, 不能通过该组织发送消息");}}public void recieveMessage(String from, String msg) {System.out.println(from "发送消息给" countryName ":" msg);}public void setWTO(Group wto) {this.wto = wto;}public void setWIO(Group wio) {this.wio = wio;}public void setWHO(Group who) {this.who = who;}public Group getWto() {return this.wto;}public Group getWho() {return this.who;}public Group getWio() {return this.wio;}public String getCountryName() {return countryName;}}class China extends Country {public China() {super("China");}}class Japan extends Country {public Japan() {super("Japan");}}class America extends Country {public America() {super("USA");}}abstract class Group {protected String groupName;protected Hashtable<String, Country> CountryList = new Hashtable<String, Country>();public Group(String name) {groupName = name;}public void register(Country country) {if (!CountryList.contains(country)) {CountryList.put(country.getCountryName(), country);}}public void sendText(String from, String to, String msg) {Country country = CountryList.get(to);if (country != null) {System.out.println(groupName "传达" from "给" to "的消息");country.recieveMessage(from, msg);} else {System.out.println(to "未加入" groupName ", 不能接收来自该组织的消息");}}}class WTO extends Group {public WTO() {super("WTO");}@Overridepublic void register(Country country) {super.register(country);country.setWTO(this);}}class WHO extends Group {public WHO() {super("WHO");}@Overridepublic void register(Country country) {super.register(country);country.setWHO(this);}}class WIO extends Group {public WIO() {super("WIO");}@Overridepublic void register(Country country) {super.register(country);country.setWIO(this);}}结果：
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