第十二篇 设计模式--享元模式

定义：运用共享技术有效地支持大量细粒度对象。

代码：

package flyweight_model;import java.util.Hashtable;/** * @author naivor *享元模式-场景类 */public class FlyweightModel {public static void main(String[] args) {FlyweightFactory factory=new FlyweightFactory();Flyweight flyweight=factory.getFlayweight("A");flyweight.operate();UnSharedFlyweight unFlyweight=new UnSharedFlyweight();unFlyweight.operate();}}/** *  * @author naivor *享元模式-享元抽象类 */abstract class Flyweight{public abstract void operate();}/** *  * @author naivor *享元模式-共享的Flyweight子类 */class SharedFlyweight extends Flyweight{@Overridepublic void operate() {//SharedFlyweight的业务逻辑}}/** *  * @author naivor *享元模式-非共享的Flyweight子类 */class UnSharedFlyweight extends Flyweight{@Overridepublic void operate() {//UnSharedFlyweight的业务逻辑}}/** *  * @author naivor *享元模式-享元工厂类 */class FlyweightFactory {private Hashtable<String, Flyweight> flyweights=new Hashtable<String, Flyweight>();public FlyweightFactory() {flyweights.put("A", new SharedFlyweight());flyweights.put("B", new SharedFlyweight());flyweights.put("C", new SharedFlyweight());}public Flyweight getFlayweight(String type){Flyweight flyweight=flyweights.get(type);if (flyweight==null) {flyweight=new SharedFlyweight();flyweights.put(type, flyweight);}return flyweight;}}