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Add Binary Search Implemetation in Java #6334

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SChandrasekhar96
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@SChandrasekhar96 SChandrasekhar96 commented Jul 1, 2025 •
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This PR adds an implementation of a Binary Search Tree (BST) in Java under the tree package.

Features:

  • Insertion of nodes
  • Inorder Traversal
  • Preorder Traversal
  • Postorder Traversal

Closes #6334

  • 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

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codecov-commenter commented Jul 1, 2025 •
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Codecov Report

Attention: Patch coverage is 0% with 37 lines in your changes missing coverage. Please review.

Project coverage is 74.18%. Comparing base (ebf5c3d) to head (a2da0d7).

Files with missing lines Patch % Lines
.../java/com/thealgorithms/tree/BinarySearchTree.java 0.00% 37 Missing ⚠️
Additional details and impacted files 
@@             Coverage Diff              @@
##             master    #6334      +/-   ##
============================================
- Coverage     74.33%   74.18%   -0.15%     
+ Complexity     5391     5390       -1     
============================================
  Files           679      680       +1     
  Lines         18820    18857      +37     
  Branches       3646     3648       +2     
============================================
+ Hits          13989    13990       +1     
- Misses         4274     4310      +36     
  Partials        557      557

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@vil02
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vil02 commented Jul 1, 2025

I have an impression that this is already implemented in BinaryTree.java.

@SChandrasekhar96
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I have an impression that this is already implemented in BinaryTree.java.

Hi @vil02, thank you for pointing that out!

I checked BinaryTree.java, and it appears to implement a general binary tree without enforcing BST properties during insertion (i.e., no ordering based on key values). This PR provides a specific Binary Search Tree implementation where nodes are inserted based on the BST rule: left < root < right.

If you'd still prefer this be merged under BinaryTree.java or as an enhancement to it, I’m happy to modify the structure accordingly.

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@SChandrasekhar96 @codecov-commenter @vil02