Classic case of java facade pattern
Class diagram:
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/** * 角色 * @author stone * */ public class Actor { public Actor(String name) { System.out.println("创建了角色: " + name); } public void load() { System.out.println("角色加载"); } public void unload() { System.out.println("角色退出,存档"); } }
/** * 场景 * @author stone * */ public class Scene { public Scene(String name) { System.out.println("创建了场景: " + name); } public void load() { System.out.println("场景加载"); } public void unload() { System.out.println("场景卸载"); } }
/** * 外观类,即一个业务功能类,它的实现需要持有其他具体的 业务对象 * @author stone * */ public class Facade { Actor actor; Scene scene; public Facade() { this.actor = new Actor("lisi"); this.scene = new Scene("海天盛宴"); } public void startGame() { actor.load(); scene.load(); } public void endGame() { actor.unload(); scene.unload(); } }
/** * 外观(Facade)模式 * 简单的说就是降低了类与类之间的耦合度,使用一个Facade类来持有原有类的引用。它使用的频率其实非常的高 * 跟静态代理在实现上有些类似,不同的是,外观模式中可以持有多个实体对象的引用,进行组合实现业务功能 * @author stone * */ public class Test { public static void main(String[] args) { /* * 如果不使用外观模式,那么在Actor和Scene可能至少一方需要持有对方的引用 * 当需要添加新的具体功能类时,只需要在Facade中添加一个引用,在相应的周期函数中使用即可 */ Facade facade = new Facade(); facade.startGame(); System.out.println("----"); facade.endGame(); } }
创建了角色: lisi 创建了场景: 海天盛宴 角色加载 场景加载 ---- 角色退出,存档 场景卸载
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