[java] simplified some control flows logic and removed unused imports

[iampopovich]

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Description

changes are provided to increase code readability
removing unused imports provided to increase code clearness and decrease build time also

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (de7acb9) 54.85% compared to head (60af42e) 54.85%.

❗ Current head 60af42e differs from pull request most recent head 606ddfe. Consider uploading reports for the commit 606ddfe to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #11974   +/-   ##
=======================================
  Coverage   54.85%   54.85%           
=======================================
  Files          86       86           
  Lines        5728     5728           
  Branches      233      233           
=======================================
  Hits         3142     3142           
  Misses       2353     2353           
  Partials      233      233           

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[diemol]

Thank you for this PR. I left a small comment.