简单工厂模式

 

package com.mhm.simplefactory;/** *  * @author Administrator * @描述 抽象产品角色 */public interface Car {public void drive();}package com.mhm.simplefactory;/** *  * @author Administrator * @描述 奔驰车，具体产品角色 */public class Benz implements Car {@Overridepublic void drive() {System.out.println("开奔驰车");}}package com.mhm.simplefactory;/** *  * @author Administrator * @描述 宝马车，具体产品角色 */public class Bmw implements Car {@Overridepublic void drive() {System.out.println("开宝马车");}}package com.mhm.simplefactory;/** *  * @author Administrator * @描述 工厂类角色 */public class Driver {public static Car driveCar (String carName) throws Exception {if (carName.equalsIgnoreCase("benz")) {return new Benz();} else if (carName.equalsIgnoreCase("bmw")) {return new Bmw();} else {throw new Exception("没有此车");}}}package com.mhm.simplefactory;/** * @描述 开车人 * @author Administrator * */public class Magnate {public static void main(String[] args) {try {Car car = Driver.driveCar("bmw");car.drive();} catch (Exception e) {e.printStackTrace();}}}

 

当车多后，需要修改工厂类，这不符合开闭模式（对扩展开放，对修改封闭）

所以后续使用工厂方法模式。