外部類委托內部類變相實現多繼承

1.Student

1 public class Student {
2     public void study(){
3         System.out.println("學生學習---");
4     }
5 }

2.Worker

1 public class Worker {
2     public void work(){
3         System.out.println("工人工作----");
4     }
5 
6 }

3.GraduateStudent

 1 /**
 2  * 在職研究生類（既可以學習 +又能工作）
 3  * @author ganchuanpu
 4  *
 5  */
 6 public class GraduateStudent extends Student{
 7     
 8     class Innner extends Worker{
 9         
10     }
11 
12 }

4.Test

public class TestInner {
    
    public static void main(String[] args) {
        GraduateStudent graduateStudent=new GraduateStudent();
        
        graduateStudent.study();
        System.out.println("---------------------");
        graduateStudent.new Innner().work();
        
    }

}

學生學習---
---------------------
工人工作----