Java补充

optional

 

 

string，int转换：

https://www.cnblogs.com/vhyc/p/7684475.html

int 和 long， int 转换 long b= a，反过来 int a = （int)b

https://www.cnblogs.com/vhyc/p/10784432.html

json

前端：https://www.cnblogs.com/vhyc/p/8434529.html

Java：https://www.cnblogs.com/vhyc/p/10439064.html

guava

https://www.cnblogs.com/vhyc/p/10669595.html

apacha.common.util

https://www.cnblogs.com/vhyc/p/10666116.html