api 各方法详解(很不错!)
http://blog.51cto.com/turnsole/2093185
api 各方法 简介:
https://www.cnblogs.com/guguli/p/4396093.html
集合操作:
https://www.cnblogs.com/duanxz/archive/2012/07/19/2598726.html
https://blog.csdn.net/dalinsi/article/details/78046503
集合与数组互转:
https://blog.csdn.net/chsyd1028/article/details/77069548
https://blog.csdn.net/u010429286/article/details/53377836