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thealgorithms/java

🔥 Hot★ 65,674JavaAudience · developerComplexity · 1/5ActiveLicenseSetup · easy

TLDR

A collection of classic algorithms and data structures implemented in Java for learning. Browse, understand, and run code examples without setup.

Mindmap

mindmap
  root((repo))
    What it does
      Algorithm implementations
      Data structure examples
      Educational reference
    Learning focus
      Readable code
      Step-by-step logic
      No local setup needed
    Use cases
      Study for interviews
      Learn algorithm basics
      Reference implementations
    Tech stack
      Java
      Browser environment
    Audience
      Students
      Early-career developers
      CS learners

Things people build with this

USE CASE 1

Study classic sorting, searching, and graph algorithms before a coding interview.

USE CASE 2

Learn how to implement common data structures like linked lists, trees, and hash tables in Java.

USE CASE 3

Reference working code examples when learning computer science fundamentals in a course.

Tech stack

Java

Getting it running

Difficulty · easy Time to first run · 5min
Use freely for any purpose, including commercial use, as long as you keep the copyright notice and license text.

In plain English

TheAlgorithms/Java is a learning resource that contains implementations of common algorithms and data structures written in Java. An algorithm is a step-by-step procedure for solving a problem, things like sorting a list, searching for a value, or traversing a tree structure. This collection is built for educational purposes, meaning the goal is readable, understandable code rather than maximum performance. The repository notes that implementations may be less efficient than what the Java standard library provides. Students, early-career developers, or anyone studying computer science concepts would use this as a reference to see how classic algorithms look in Java code. It is also open to community contributions, and each algorithm can be run or edited directly in a browser-based environment without local setup.

Copy-paste prompts

Prompt 1
Show me how to implement a binary search algorithm in Java using code from TheAlgorithms/Java.
Prompt 2
I need to understand how quicksort works. Can you walk me through the Java implementation in TheAlgorithms/Java?
Prompt 3
What's the difference between depth-first and breadth-first tree traversal? Show me both implementations from TheAlgorithms/Java.
Prompt 4
Help me understand how a hash table collision is handled by looking at the Java implementation in TheAlgorithms/Java.
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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.