flyweight享元模式-Java实现

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什么是享元模式

享元，顾名思义就是共享一些事先创建好的对象。
如果程序员需要频繁创建相同的对象，并且创建对象的代价很高，这个时候享元模式就是一个很不错的解决方案。

享元模式的成员

1. 享元抽象类或者接口
2. 享元工厂
3. 享元类
4. 客户端

代码实现

汽车接口（享元接口）

package com.stone.designpattern.flyweight;/*** @author Stone Wang* Interface of vehicle* has two methods start and stop with void return**/
public interface IVehicle {public static final String VERSION = "1.0";public void start();public void stop();}

汽车实现（享元类）

package com.stone.designpattern.flyweight;public class Vehicle implements IVehicle {private final String type;public Vehicle(String type) {this.type = type;}public String getType() {return type;}@Overridepublic void start() {System.out.println(String.format("Vehicle %s is started", type));}@Overridepublic void stop() {System.out.println(String.format("Vehicle %s is stopped", type));}}

汽车工厂（享元工厂）

package com.stone.designpattern.flyweight;import java.util.*;public class VehicleFactory {private static final Map<String, IVehicle> vehicleMap = new HashMap<>();public static IVehicle getVehicle(String type) {if(vehicleMap.containsKey(type)) {return vehicleMap.get(type);}IVehicle vehicle = new Vehicle(type);vehicleMap.put(type, vehicle);return vehicle;}
}

客户端代码（客户端）

package com.stone.designpattern.flyweight;public class Main {public static void main(String[] args) {String[] types = new String[] {"Car", "Bus", "Truck", "Van", "Metro"};for(int i=0; i<10; i++) {IVehicle v = VehicleFactory.getVehicle(types[(int)(Math.random() * types.length)]);v.start();v.stop();}}}

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