标签:ring 技术 setname tair 建造者 建造者模式 技术分享 算法 span
建造模式的本质:
——分离了对象子组件的单独构造(由Builder来负责)和装配(由Director负责)。从而可以构造出复杂的对象。这个模式适用于:某个对象的构建过程复杂的情况下使用。
——由于实现了构建和装配的解耦。不同的构建器,相同的装配,也可以做出不同的对象;相同的构建器,不同的装配顺序也可以做出不同的对象。也就是实现了构建算法、装配算法的解耦,实现了更好的复用。
例:
1. 定义飞船类以及发动机、轨道舱、逃逸塔类:
1 package com.ztq.builder; 2 3 public class AirShip { 4 private OrbitalModule orbitalModule; //轨道舱 5 private Engine engine; //发动机 6 private EscapeTower escapeTower; //逃逸塔 7 8 public void launch(){ 9 System.out.println("发射!"); 10 } 11 public OrbitalModule getOrbitalModule() { 12 return orbitalModule; 13 } 14 public void setOrbitalModule(OrbitalModule orbitalModule) { 15 this.orbitalModule = orbitalModule; 16 } 17 public Engine getEngine() { 18 return engine; 19 } 20 public void setEngine(Engine engine) { 21 this.engine = engine; 22 } 23 public EscapeTower getEscapeTower() { 24 return escapeTower; 25 } 26 public void setEscapeTower(EscapeTower escapeTower) { 27 this.escapeTower = escapeTower; 28 } 29 30 } 31 32 class OrbitalModule{ 33 private String name; 34 public OrbitalModule(String name){ 35 this.name = name; 36 } 37 public String getName() { 38 return name; 39 } 40 41 public void setName(String name) { 42 this.name = name; 43 } 44 } 45 46 class Engine{ 47 private String name; 48 49 public Engine(String name){ 50 this.name = name; 51 } 52 53 public String getName() { 54 return name; 55 } 56 57 public void setName(String name) { 58 this.name = name; 59 } 60 } 61 62 class EscapeTower{ 63 private String name; 64 65 public EscapeTower(String name){ 66 this.name = name; 67 } 68 public String getName() { 69 return name; 70 } 71 72 public void setName(String name) { 73 this.name = name; 74 } 75 }
2. 定义AirShipBuilder接口:
1 public interface AirShipBuilder { 2 Engine builderEngine(); 3 OrbitalModule builderOrbitalModule(); 4 EscapeTower builderEscapeTower(); 5 }
3. 定义AirShipDirector接口:
1 public interface AirShipDirector { 2 /*** 3 * 组装飞船对象 4 * 5 */ 6 AirShip directAirShip(); 7 }
4. 定义实现AirShipBuilder接口的类:
1 public class ZtqAirShipBuilder implements AirShipBuilder{ 2 3 @Override 4 public Engine builderEngine() { 5 System.out.println("构建ztq牌发动机!"); 6 return new Engine("ztq牌发动机"); 7 } 8 9 @Override 10 public OrbitalModule builderOrbitalModule() { 11 System.out.println("构建ztq牌轨道舱!"); 12 return new OrbitalModule("ztq牌轨道舱"); 13 } 14 15 @Override 16 public EscapeTower builderEscapeTower() { 17 System.out.println("构建ztq牌逃逸塔!"); 18 return new EscapeTower("ztq牌逃逸塔"); 19 } 20 }
5. 定义实现AirShipDirector接口的类:
1 public class ZtqAirShipDirector implements AirShipDirector{ 2 3 private AirShipBuilder builder; 4 5 public ZtqAirShipDirector(AirShipBuilder builder) { 6 this.builder = builder; 7 } 8 9 @Override 10 public AirShip directAirShip(){ 11 Engine e = builder.builderEngine(); 12 OrbitalModule o = builder.builderOrbitalModule(); 13 EscapeTower es = builder.builderEscapeTower(); 14 15 AirShip ship = new AirShip(); 16 ship.setEngine(e); 17 ship.setOrbitalModule(o); 18 ship.setEscapeTower(es); 19 20 return ship; 21 } 22 }
6. 定义测试类:
1 public class Client { 2 public static void main(String[] args) { 3 AirShipDirector director = new ZtqAirShipDirector(new ZtqAirShipBuilder()); 4 AirShip ship = director.directAirShip(); 5 System.out.println(ship.getEngine().getName()); 6 ship.launch(); 7 } 8 }
打印结果:
构建ztq牌发动机!
构建ztq牌轨道舱!
构建ztq牌逃逸塔!
ztq牌发动机
发射!
UML图:
标签:ring 技术 setname tair 建造者 建造者模式 技术分享 算法 span
原文地址:http://www.cnblogs.com/zhangtianq/p/6002295.html