反射机制

/面向接口编程-》解藕

反射机制（properties）(放在文件中实现)

1）接口里所有方法都是抽象方法

2）接口中的变量都是常量final int i=0;方法都是public abstract void say();3）可以实现多个接口*********反射机制（properties）*******************************概述：使用反射机制之后耦合强度大大减弱，几乎变得无关，只有于meeting.properties有关只用修改meeting.properties中的value即可步骤：1）新建一个meeting.properties文件取name为talkmethod取value为javabase.TalkInAmerica2）

 

import java.io.IOException;import java.util.Properties;public interface TalImp {  final int i=0;  public abstract void say();//说话}//public class TalkInAmerica implements TalImp {     public void say() {      System.out.println("TALK with English"); }}/public class TalkInChina implements TalImp {     public void say() {       System.out.println("中国话");  }}public class Meeting {   public void doMeeting(TalImp talk){    //开会    talk.say();   }   public static void main(String args[]){    Meeting meeting=new Meeting();   Properties pro=new Properties();     TalImp talk;  try {   pro.load(Meeting.class.getResourceAsStream("meeting.properties"));  } catch (IOException e) {   e.printStackTrace();  }  String classname=pro.getProperty("talkmethod");  try {   talk=(TalImp)Class.forName(classname).newInstance();   meeting.doMeeting(talk);  } catch (InstantiationException e) {   e.printStackTrace();  } catch (IllegalAccessException e) {   e.printStackTrace();  } catch (ClassNotFoundException e) {   e.printStackTrace();  }      }}