improve coding styles

[JacksonTian]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.16%. Comparing base (64983d9) to head (0d6dc9e).

Files	Patch %	Lines
...core/src/main/java/com/aliyuncs/RpcAcsRequest.java	50.00%	0 Missing and 1 partial ⚠️
...in/java/com/aliyuncs/auth/SHA256withRSASigner.java	0.00%	1 Missing ⚠️
...in/java/com/aliyuncs/auth/V3SignatureComposer.java	0.00%	0 Missing and 1 partial ⚠️
...a/com/aliyuncs/endpoint/EndpointResolverRules.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #913      +/-   ##
============================================
+ Coverage     89.89%   90.16%   +0.27%     
+ Complexity     1640     1638       -2     
============================================
  Files           123      123              
  Lines          4689     4656      -33     
  Branches        536      535       -1     
============================================
- Hits           4215     4198      -17     
+ Misses          347      331      -16     
  Partials        127      127              

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