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享元模式
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‎src/com/anxpp/designpattern/flyweight/IWeather.java‎

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package com.anxpp.designpattern.flyweight;
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//享元接口
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public interface IWeather {
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void printWeather();
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}

‎src/com/anxpp/designpattern/flyweight/SimpleFlyweight.java‎

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package com.anxpp.designpattern.flyweight;
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import java.util.HashMap;
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//简单的享元模式
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public class SimpleFlyweight {
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public static void main(String args[]){
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FlyweightFactory factory = new FlyweightFactory();
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IFlyweight flyweight1,flyweight2,flyweight3,flyweight4;
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flyweight1 = factory.getFlyweight("value1");
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flyweight2 = factory.getFlyweight("value1");
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flyweight3 = factory.getFlyweight("value1");
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flyweight4 = factory.getFlyweight("value2");
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flyweight1.doSomething();
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flyweight2.doSomething();
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flyweight3.doSomething();
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flyweight4.doSomething();
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System.out.println(factory.size());
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}
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}
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//享元接口
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interface IFlyweight{
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void doSomething();
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}
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//具体享元
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class Flyweight implements IFlyweight{
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private String value;
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public Flyweight(String value){
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this.value = value;
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}
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@Override
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public void doSomething() {
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System.out.println(value);
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}
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}
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//享元工厂
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class FlyweightFactory{
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HashMap<String, IFlyweight> flyweights = new HashMap<String, IFlyweight>();
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IFlyweight getFlyweight(String value){
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IFlyweight flyweight = flyweights.get(value);
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if(flyweight == null){
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flyweight = new Flyweight(value);
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flyweights.put(value, flyweight);
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}
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return flyweight;
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}
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public int size(){
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return flyweights.size();
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}
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}

‎src/com/anxpp/designpattern/flyweight/TestUse.java‎

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package com.anxpp.designpattern.flyweight;
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public class TestUse {
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public static void main(String args[]){
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WeatherFactory factory = new WeatherFactory();
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IWeather weather1,weather2,weather3,weather4,weather5,weather6,weather7,weather8;
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weather1 = factory.getFlyWeight("多云",15);
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weather2 = factory.getFlyWeight("晴",23);
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weather3 = factory.getFlyWeight("多云",16);
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weather4 = factory.getFlyWeight("阴",10);
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weather5 = factory.getFlyWeight("多云",15);
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weather6 = factory.getFlyWeight("多云",15);
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weather7 = factory.getFlyWeight("多云",15);
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weather8 = factory.getFlyWeight("多云",15);
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weather1.printWeather();
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weather2.printWeather();
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weather3.printWeather();
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weather4.printWeather();
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weather5.printWeather();
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weather6.printWeather();
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weather7.printWeather();
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weather8.printWeather();
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System.out.println("实际对象个数" + factory.getFlyweightSize());
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}
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}

‎src/com/anxpp/designpattern/flyweight/Weather.java‎

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package com.anxpp.designpattern.flyweight;
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//具体享元
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public class Weather implements IWeather{
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private String weather;
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private Integer temperature;
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public Weather(String weather,int temperature){
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this.weather = weather;
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this.temperature = temperature;
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}
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@Override
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public void printWeather() {
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System.out.print("天气:" + weather);
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System.out.println(" 温度:" + temperature);
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}
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@Override
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public boolean equals(Object obj) {
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Weather weather = (Weather)obj;
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return weather.weather.equals(this.weather)&&weather.temperature==temperature;
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}
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@Override
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public int hashCode() {
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return (weather.hashCode()+temperature.hashCode())/2;
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}
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}

‎src/com/anxpp/designpattern/flyweight/WeatherFactory.java‎

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package com.anxpp.designpattern.flyweight;
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import java.util.HashMap;
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//享元工厂
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public class WeatherFactory {
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private HashMap<IWeather, IWeather> weathers;
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public WeatherFactory(){
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weathers = new HashMap<IWeather, IWeather>();
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}
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public IWeather getFlyWeight(String weather,int temperature){
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Weather objectWeather = new Weather(weather, temperature);
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IWeather flyweight = weathers.get(objectWeather);
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if(flyweight == null){
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flyweight = objectWeather;
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weathers.put(objectWeather, flyweight);
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}
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else objectWeather = null;//方便gc回收
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return flyweight;
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}
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public int getFlyweightSize(){
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return weathers.size();
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}
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}

‎src/com/anxpp/designpattern/flyweight/package-info.java‎

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/**
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* @author Administrator
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* 享元模式
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*/
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package com.anxpp.designpattern.flyweight;

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