总结于尚硅谷视频
十 枚举类&注解
1 枚举类的使用
2 注解的使用
可以看这为大佬写的博客。他写的非常详细。
https://blog.csdn.net/shengzhu1/article/details/81271409?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522161845126016780264093213%2522%252C%2522scm%2522%253A%252220140713.130102334…%2522%257D&request_id=161845126016780264093213&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2alltop_positive~default-1-81271409.first_rank_v2_pc_rank_v29&utm_term=java%E6%B3%A8%E8%A7%A3
