sonar manages code quality

sonar manages code quality

 

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1 The basic knowledge of JAVA is not solid, which violates some basic principles of coding

  replace new Intger(int) with Interger.ValueOf()

   Integer==int error, trigger unboxing of null pointer

    Inappropriate use of Equals

    There is a problem with null judgment

  stream is not closed

  。。。。。。。。。。。。。。

 

2 The function implementation is unreasonable and too complicated

 

3 Unsightly