java实现多继承,使用内部类
https://blog.csdn.net/rocling/article/details/82350515
内部类就是类里面的类
https://www.cnblogs.com/dolphin0520/p/3811445.html
https://blog.csdn.net/rocling/article/details/82350515
内部类就是类里面的类
https://www.cnblogs.com/dolphin0520/p/3811445.html