Algorithms in Java Series
Last updated: June 10, 2026
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
Refactor Java code safely — and automatically — with OpenRewrite.
Refactoring big codebases by hand is slow, risky, and easy to put off. That’s where OpenRewrite comes in. The open-source framework for large-scale, automated code transformations helps teams modernize safely and consistently.
Each month, the creators and maintainers of OpenRewrite at Moderne run live, hands-on training sessions — one for newcomers and one for experienced users. You’ll see how recipes work, how to apply them across projects, and how to modernize code with confidence.
Join the next session, bring your questions, and learn how to automate the kind of work that usually eats your sprint time.
Algorithms are at the heart of software development, providing foundational solutions to recurring computational problems. From classic sorting routines and graph traversal to advanced optimization and concurrency patterns, a strong grasp of algorithms enables Java developers to write code that is both efficient and correct.
This curated series covers the most important algorithms implemented in Java, organized by topic to guide you from core sorting and searching techniques through graph theory, mathematical computation, string processing, and systems design.
Sorting and Searching
- Binary Search Algorithm in Java
- Bubble Sort in Java
- Selection Sort in Java
- Merge Sort in Java
- Quicksort Algorithm Implementation in Java
- Heap Sort in Java
- Radix Sort in Java
Graph and Tree Algorithms
- Implementing a Binary Tree in Java
- Graphs in Java
- Depth First Search in Java
- Breadth-First Search Algorithm in Java
- Guide to AVL Trees in Java
- Dijkstra Shortest Path Algorithm in Java
- Implementing A* Pathfinding in Java
Array and String Algorithms
- Java Two Pointer Technique
- Maximum Subarray Problem in Java
- Permutations of an Array in Java
- Reversing a Linked List in Java
- Balanced Brackets Algorithm in Java
- The Caesar Cipher in Java
- How to Calculate Levenshtein Distance in Java?
Mathematical Algorithms
- Calculate Factorial in Java
- Fibonacci Series in Java
- Finding Greatest Common Divisor in Java
- Finding the Least Common Multiple in Java
- Matrix Multiplication in Java
- Java Program to Print Pascal’s Triangle
Optimization and AI Algorithms
- Introduction to Greedy Algorithms with Java
- Knapsack Problem Implementation in Java
- Introduction to Minimax Algorithm with a Java Implementation
- Create a Sudoku Solver in Java
- Example of Hill Climbing Algorithm in Java
- A Maze Solver in Java
Concurrency and Systems Algorithms
