fix checkstyle for core/EntityManager by seagle-yuan · Pull Request #1841 · apache/hugegraph

@@             Coverage Diff              @@
##             master    #1841      +/-   ##
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+ Coverage     64.45%   70.74%   +6.28%     
- Complexity      914      982      +68     
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  Files           447      447              
  Lines         38040    38040              
  Branches       5389     5389              
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+ Hits          24520    26911    +2391     
+ Misses        11000     8496    -2504     
- Partials       2520     2633     +113