标签：style extend pack 创建对象 otf dex pre extends void
定义： 定义一个用于创建对象的接口，让子类决定实例化哪一个类。工厂方法使一个类的实例化延迟到其子类。
好处： 良好的封装性，调用一个产品只需要知道产品的类名即可。再次，屏蔽产品类，例如在从Mysql切换到Oracle的时候，只需要切换一下驱动名称即可。
package nyx.learn.factory; public abstract class AbstractFactory { public abstract <T extends IHuman> T createHuman(Class<T> c); }
package nyx.learn.factory; public class HumanFactory extends AbstractFactory{ @Override public <T extends IHuman> T createHuman(Class<T> c) { IHuman human = null; try { System.out.println(c.getName()); human = (IHuman)Class.forName(c.getName()).newInstance(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } return (T)human; } }
package nyx.learn.factory; public interface IHuman { void getColor(); void talk(); }
package nyx.learn.factory; public class BlackHuman implements IHuman { @Override public void getColor() { System.out.println("黑色皮肤！"); } @Override public void talk() { System.out.println("说黑话！"); } }
package nyx.test.factory; import nyx.learn.factory.AbstractFactory; import nyx.learn.factory.BlackHuman; import nyx.learn.factory.HumanFactory; public class Main { public static void main(String[] args) { AbstractFactory factory = new HumanFactory(); BlackHuman human = factory.createHuman(BlackHuman.class); human.getColor(); human.talk(); } }
工厂模式的扩展：
1、缩小为简单工厂 SimpleFactory
package nyx.learn.factory; public class SimpleFactory { public static <T extends IHuman> T createHuman(Class<T> c){ IHuman human = null; try { human = (IHuman)Class.forName(c.getName()).newInstance(); } catch (Exception e) { e.printStackTrace(); } return (T)human; } }
package nyx.test.factory; import nyx.learn.factory.BlackHuman; import nyx.learn.factory.IHuman; import nyx.learn.factory.SimpleFactory; public class Main { public static void main(String[] args) { IHuman human = SimpleFactory.createHuman(BlackHuman.class); human.getColor(); human.talk(); } }
简单工厂就是在工厂模式的基础上，去掉继承的抽象类，将方法改成static关键字。可以不需要new 一个工厂，直接调用工厂，产生产品类，简化模式。
标签：style extend pack 创建对象 otf dex pre extends void
原文地址：http://www.cnblogs.com/xz-blogs/p/7143263.html
