一：背景介绍

米老师需要开办公室的门，需要进入办公室进行工作。这时候需要何老师来进行开门的操作。

二：思路&方案

1.面向过程

何老师管理钥匙，米老师需要开门，何老师把钥匙方法一个位置上。米老师到壹佰之后去拿钥匙自己去执行开门的操作。

2.面向对象

米老师到达公司之后，米老师喊一下何老师打开办公室的门，何老师听到消息之后就过来开门了。

3.面向对象(反射)

米老师到达公司之后，米老师喊了一下给我开一下办公室的门，听到米老师消息的任意一个老师都可以过来开门。

三：过程

1.面向过程：原本何老师的作用交给我了米老师来完成。

代码

public class Client {public static void main(String[] args) {System.out.println("米老师：我需要开门");System.out.println("何老师：米老师，钥匙放在前台了，您开一下吧");System.out.println("米老师：去前台拿钥匙自己去开门了");}
}

效果

2.面向对象：把开门的方法完全交个何老师，米老师不需要有开门的操作

客户端

public class Client {public static void main(String[] args) {Notice notice=new Notice();notice.notice();}
}

业务封装类

public class Notice {private void TeahcerMiDependTeacherHeBusiness(){ReceiveMsg receiveMsgTeacherHe=new ReceiveMsg();receiveMsgTeacherHe.receiveMsg(new SendMsg());}public void notice(){this.TeahcerMiDependTeacherHeBusiness();}
}

发消息类

public class SendMsg {public void sendMsg(){System.out.println("米老师：我需要开一下门");}
}

收消息类

public class ReceiveMsg {private void open(){System.out.println("何老师：开门中。。。。。。门已打开");}public void receiveMsg(SendMsg sendMsgTeacherMi){sendMsgTeacherMi.sendMsg();this.open();}
}

结果

3.面向对象(反射)：米老师不仅仅可以叫何老师来开门，也可以叫其他老师开门

客户端

public class Client {public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, IOException {Notice notice=new Notice();notice.notice();}
}

业务封装类

public class Notice {private void MiAndHeBusiness() throws ClassNotFoundException, InvocationTargetException, IllegalAccessException, NoSuchMethodException, InstantiationException, IOException {TeacherHe teacherHe = new TeacherHe();teacherHe.acceptMessage();}public void notice() throws ClassNotFoundException, InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException, IOException {this.MiAndHeBusiness();}
}

发送消息类

public class TeacherMi {public void sendMsg(){System.out.println("我需要开一下门");}public void sendMsgAndKey(String room,String key){System.out.println("这是"+room+"以后"+key+"由你来保管，快开门吧");}public static void sendMessage(){System.out.println("帮我开一下办公室的门");}
}

接收消息类

public class TeacherHe {public void acceptMessage() throws IOException, ClassNotFoundException, InvocationTargetException, IllegalAccessException, NoSuchMethodException, InstantiationException {this.acceptMsg();}private void acceptMsg() throws IllegalAccessException, InvocationTargetException, ClassNotFoundException, NoSuchMethodException, InstantiationException, IOException {BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("请输入要依赖的类路径");String className=br.readLine();System.out.println("请输入要执行的方法");String methodName=br.readLine();System.out.println("请输入方法要传入的第一个参数");String roomName=br.readLine();System.out.println("请输入方法要传入的第一个参数");String keyName=br.readLine();br.close();Class sendMsgClass=Class.forName(className);Method sendMsgMethod= sendMsgClass.getMethod(methodName,String.class,String.class);Object sender =  sendMsgClass.newInstance();sendMsgMethod.invoke(sender,roomName,keyName);System.out.println("收到了，我来开门了");this.open();}private void open(){System.out.println("正在开门中。。。。。。。。。。。 门开了");}
}

结果