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Java
Practical Java tutorials covering Javalin, collections, null safety, equality, memory management, and backend development.
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Javalin Tutorial: Build a Java REST API
Learn Javalin by building a Java REST API with routes, path parameters, JSON, validation, error handling, WebSockets, and asynchronous handlers.
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Javalin File Upload: Simple Examples for Beginners
Master Javalin file uploads with step-by-step examples. Learn basic to advanced implementation techniques including file validation, error handling, and security best practices.
Read moreJavalin Servlets and Filters
Master Javalin Servlets and Filters with practical examples. Learn essential concepts through easy-to-follow code snippets perfect for Java beginners.
Read moreWhat is the Difference Between `==` and `equals()` in Java?
Learn the key differences between == and equals() in Java, including examples, best practices, and when to use each. Understand how to compare objects and primitives effectively.
Read moreHashMap vs Hashtable in Java
Learn the key differences between HashMap and Hashtable in Java, including synchronization, performance, and usage. Discover when to use each and explore modern alternatives like ConcurrentHashMap.
Read moreHow to Avoid Checking for Nulls in Java
Learn how to avoid null checks in Java using Optional, the Null Object Pattern, annotations, and modern libraries. Discover best practices for writing cleaner, null-safe code.
Read moreCreate, Detect, and Handle Memory Leaks in Java
Learn what is memory leak in Java, how to create, detect, and handle memory leaks in Java and Spring Boot. Includes examples, tools, and tips for fixing stack and byte array memory leaks.
Read moreJava NullPointerException, and How Do I Fix It?
Learn Java what a NullPointerException is, why it occurs, and how to fix and prevent it in your code. Explore practical solutions, best practices, and resources for handling null references effectively.
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