某房地產公司欲開發一套房產信息管理系統，根據如下描述選擇合適的設計模式進行設計：

(1) 該公司有多種房型，如公寓、別墅等，在將來可能會增加新的房型；

(2) 銷售人員每售出一套房子，主管將收到相應的銷售消息。

?該例子的第一步使用工廠設計模式來制作，第二步使用觀察者模式來制作

?

觀察者借口

public interface Stakeholder {public void response(House house); }

?具體觀察者

public class Manager implements Stakeholder{@Overridepublic void response(House house) {System.out.println("房子"+house.getId()+"已經售出，價格為"+house.getPrice());} }

工廠生產公寓和別墅（也可以用接口）

HouseCreator public abstract class HouseCreator {public abstract House createHouse(); }

公寓和別墅

public class ViliadomCreator extends HouseCreator{@Overridepublic House createHouse() {return new Viliadom();} } public class Viliadom extends House{@Overridepublic List<Stakeholder> getStakeholders() {return super.getStakeholders();}@Overridepublic void setStakeholders(List<Stakeholder> stakeholders) {super.setStakeholders(stakeholders);}@Overridepublic String getId() {return super.getId();}@Overridepublic void setId(String id) {super.setId(id);}@Overridepublic double getPrice() {return super.getPrice();}@Overridepublic void setPrice(double price) {super.setPrice(price);}@Overridepublic int getStatus() {return super.getStatus();}@Overridepublic void setStatus(int status) {super.setStatus(status);} }

第二個

public class ApartCreator extends HouseCreator{@Overridepublic House createHouse() {return new Apartment();} } public class Apartment extends House{@Overridepublic List<Stakeholder> getStakeholders() {return super.getStakeholders();}@Overridepublic void setStakeholders(List<Stakeholder> stakeholders) {super.setStakeholders(stakeholders);}@Overridepublic String getId() {return super.getId();}@Overridepublic void setId(String id) {super.setId(id);}@Overridepublic double getPrice() {return super.getPrice();}@Overridepublic void setPrice(double price) {super.setPrice(price);}@Overridepublic int getStatus() {return super.getStatus();}@Overridepublic void setStatus(int status) {super.setStatus(status);} }

House

public class House {protected List<Stakeholder> stakeholders=new ArrayList<Stakeholder>();private String id;private double price;private int status;public List<Stakeholder> getStakeholders() {return stakeholders;}public void setStakeholders(List<Stakeholder> stakeholders) {this.stakeholders = stakeholders;}public String getId() {return id;}public void setId(String id) {this.id = id;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public int getStatus() {return status;}public void setStatus(int status) {this.status = status;} }

測試類

public class Text2 {public static void main(String[] args) {House house1=new Viliadom();House house2=new Apartment();Stakeholder obs1=new Manager();house1.setId("VILIADOM");house1.setPrice(1000000000);house2.setId("APARTMENT");house2.setPrice(1000000000);obs1.response(house1);obs1.response(house2);} }

結果：

總結

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