工厂模式
1、作用：实例化对象，同时为了增加可扩展性，用户看到的只是接口和抽象类，接口代表的是产品，抽象类是工厂。
2、类图：
3、类图实现
产品：
（1）接口
public interface ICar { public void createCar(); }
（2）三个实现类实现结构 top mid low
public class LowCar implements ICar { @Override public void createCar() { // TODO Auto-generated method stub System.out.println("low car"); } } public class MidCar implements ICar { @Override public void createCar() { // TODO Auto-generated method stub System.out.println("mid car"); } } public class TopCar implements ICar { @Override public void createCar() { // TODO Auto-generated method stub System.out.println("top car"); } }
（3）抽象工厂 AbstracFactory
public abstract class AbstractFactory { public abstract ICar create(); }
（4）三个实现类 继承抽象工厂 top mid low
public class LowCarFactory extends AbstractFactory { @Override public ICar create() { // TODO Auto-generated method stub return new LowCar(); } } public class MidCarFactory extends AbstractFactory { @Override public ICar create() { // TODO Auto-generated method stub return new MidCar(); } } public class TopCarFactory extends AbstractFactory { @Override public ICar create() { // TODO Auto-generated method stub return new TopCar(); } }
（5）测试类 分别使用->(实线)只调用接口和抽象类
public class User { public static void main(String[] args) { // TODO Auto-generated method stub AbstractFactory factory = new TopCarFactory(); ICar car = factory.create(); car.createCar(); } }
原文：http://www.cnblogs.com/sunshisonghit/p/4370208.html
