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Table of Contents

• ↓ Java Compact Source File: No Class, No Static Main
• ↓ Java Scoped Values Example
• ↓ Spring Boot RAG Example with Spring AI
• ↓ Java AtomicInteger Example
• ↓ Java Virtual Threads Example
• ↓ Spring Boot Supabase CRUD Example
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"Java compact source file example – a Java file with no class and no public static void main. Learn instance main methods, the IO class, and the launch order, with full runnable code and real output."

"Learn Java scoped values (JEP 506) with simple, runnable examples. See the problem they solve, how other languages do it, and how to share data with callees and child threads without method parameters. Tested with Java 25."

"Learn RAG (Retrieval Augmented Generation) in Spring Boot with Spring AI. Load your own notes into a vector store and let the AI answer questions about them."

"Learn Java AtomicInteger with simple examples, tested on Java 25. See why a normal int breaks with threads, and how incrementAndGet, compareAndSet and updateAndGet fix it."

Key Topics & Focus Areas for mkyong.com:

Java Compact Source File: No Class, No Static Main

Java Scoped Values Example

Spring Boot RAG Example with Spring AI

Java AtomicInteger Example

Java Virtual Threads Example

Spring Boot Supabase CRUD Example