Added java dsa code by Ankan Sen

[AnkanXcoder]

• 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 77.31%. Comparing base (1f98107) to head (f0e2bba).

Additional details and impacted files

@@                  Coverage Diff                   @@
##             update-directory    #6766      +/-   ##
======================================================
- Coverage               77.32%   77.31%   -0.01%     
  Complexity               6151     6151              
======================================================
  Files                     720      720              
  Lines                   20536    20536              
  Branches                 3974     3974              
======================================================
- Hits                    15879    15877       -2     
- Misses                   4051     4052       +1     
- Partials                  606      607       +1     

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[DenizAltunkapan]

@AnkanXcoder Please fix the merge conflict so I can start the review.