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.

Please upload report for BASE (master@9edfe14). Learn more about missing BASE report.
Report is 2 commits behind head on master.

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     #922   +/-   ##
=========================================
  Coverage          ?   90.06%           
  Complexity        ?     1649           
=========================================
  Files             ?      123           
  Lines             ?     4749           
  Branches          ?      537           
=========================================
  Hits              ?     4277           
  Misses            ?      346           
  Partials          ?      126           

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