infix to post fix in java

[laiba-Ashfaq]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.75%. Comparing base (9484c7e) to head (dd3efe0).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6655   +/-   ##
=========================================
  Coverage     75.75%   75.75%           
  Complexity     5772     5772           
=========================================
  Files           703      703           
  Lines         19777    19777           
  Branches       3832     3832           
=========================================
  Hits          14982    14982           
  Misses         4215     4215           
  Partials        580      580           

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[DenizAltunkapan]

This Repository contains algorithms in the language Java, but you introduced an algorithm in cpp. Please open this PR in the corresponding Repo https://github.com/TheAlgorithms/C-Plus-Plus