工厂设计模式

1. 配置文件config.properties

name=cn.mchina.client7.ui.HomeActivity1

2. 工具类homefactory

public class HomeFactory {// 单例对外提供实例public static HomeFactory homeFactory;private HomeFactory(){};public static HomeFactory getInstance(){if(homeFactory == null){homeFactory = new HomeFactory();}return homeFactory;}/** * 生成一个HomeActivity * @param name 配置文件名称 * @return HomeActivity的字节码 */public Class newHomeActivity(String name){// 读取配置文件拿到完整类名Properties p = new Properties();InputStream in = HomeFactory.class.getClassLoader().getResourceAsStream(name); try {p.load(in);} catch (IOException e) {e.printStackTrace();}String className = p.getProperty("name");// 反射生成对象Class clazz = null;try {clazz = Class.forName(className);} catch (ClassNotFoundException e) {e.printStackTrace();}return clazz;}}