設計模式(五)Builder Pattern建造者模式
阿新 • • 發佈:2018-12-05
在我們日常生活中,如構建一個飛船,一個手機,一棟建築,都會有非常複雜的組裝,這時候應該用到建造者模式
以建造一個飛船為例
案例:造小頁飛船
1.飛船各部分元件
package com.littlepage.BuilderPattern; public interface AirShipBuilder { Engine builderEngine(); OrbitalModule builderOrbitalModule(); Escape builderEscape(); }
2.飛船實體用來組裝
package com.littlepage.BuilderPattern;public class AirShip { private OrbitalModule orbitalModule; private Engine engine; private Escape escape; public void lauch(){ System.out.println("發射"); } public OrbitalModule getOrbitalModule() { return orbitalModule; } public void setOrbitalModule(OrbitalModule orbitalModule) {this.orbitalModule = orbitalModule; } public Engine getEngine() { return engine; } public void setEngine(Engine engine) { this.engine = engine; } public Escape getEscape() { return escape; } public void setEscape(Escape escape) { this.escape = escape; } }class OrbitalModule{ private String name; public OrbitalModule(String name) { this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } } class Engine{ private String name; public Engine(String name) { this.name=name; } public String getName() { return name; } public void setName(String name) { this.name = name; } } class Escape{ private String name; public Escape(String name) { this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
3.創造方法的介面
package com.littlepage.BuilderPattern; /* *組裝飛船物件 */ public interface AirShipDirector { AirShip createAirship(); }
4.實現元件(小頁飛船元件)
package com.littlepage.BuilderPattern; public class LittlePageShipBuilder implements AirShipBuilder{ @Override public Engine builderEngine() { System.out.println("頁牌發動機"); return new Engine("頁牌發動機"); } @Override public OrbitalModule builderOrbitalModule() { System.out.println("頁牌逃逸塔"); return new OrbitalModule("頁牌逃逸塔"); } @Override public Escape builderEscape() { System.out.println("頁牌軌道艙"); return new Escape("頁牌軌道艙"); } }
5.實體實現裝配
package com.littlepage.BuilderPattern; public class LittlePageAirshipDirector implements AirShipDirector{ private AirShipBuilder builder; public LittlePageAirshipDirector(AirShipBuilder builder) { this.builder = builder; } @Override public AirShip createAirship() { Engine e=builder.builderEngine(); OrbitalModule om=builder.builderOrbitalModule(); Escape et=builder.builderEscape(); AirShip ship=new AirShip(); ship.setEngine(e); ship.setOrbitalModule(om); ship.setEscape(et); return ship; } }
6.客戶端的串接(測試)
package com.littlepage.BuilderPattern; public class Client { public static void main(String[] args) { AirShipDirector dir=new LittlePageAirshipDirector(new LittlePageShipBuilder()); AirShip air=dir.createAirship(); System.out.println(air.getEngine()); air.lauch(); } }
UML結構圖