Intellij版本
IntelliJ IDEA 2018.1.2 (Ultimate Edition)
Build #IU-181.4668.68, built on April 24, 2018
避免import.*包
import包顺序问题
set this ordering (like eclipse defaults):
- static all other,
- blank,
- java.*,
- blank,
- javax.*,
- blank,
- org.*,
- blank,
- com.*,
- blank,
- all other imports
