了解继承

 1 public class Jichen {
 2     boolean worksAtHospital;
 3     void treatPatient(){
 4         System.out.println("医生为病人做检查");
 5     }
 6     public static void main(String[] args){
 7         Jichen JIN = new Jichen();
 8         JIN.treatPatient();
 9         
10         FamilyDoctor fdct = new FamilyDoctor();
11         fdct.treatPatient();
12         
13         Surgeon sdct = new Surgeon();
14         sdct.treatPatient(); //这是她调用的是自己的类
15         
16     }
17 }
18 
19 class FamilyDoctor extends Jichen{
20     boolean makesHouseCalls;
21     void giveAdvice(){
22         System.out.println("医生为病人提出诊断");
23     }
24 }
25 
26 class Surgeon extends Jichen{
27     void treatPatient(){
28         System.out.println("医生s正在给病人做检查");
29     }
30     void makeIncision(){
31         System.out.println("医生正在给病人进行截肢手术");
32     }
33 }