57.什么是反射?
https://blog.csdn.net/u012562943/article/details/54405941
58.什么是 Java 序列化?什么情况下需要序列化?
https://blog.csdn.net/Nicholas_Nick/article/details/51011622
59.动态代理是什么?有哪些应用?
https://blog.csdn.net/u010325193/article/details/83307473
60.怎么实现动态代理?
https://blog.csdn.net/qingmengwuhen1/article/details/82744737