ConcurrentHashMap vs HashMap 3. String immutability in Java 4. ArrayList vs LinkedList 5. Garbage Collection in Java 6. JVM vs JRE vs JDK 7. Checked vs Unchecked Exceptions 8. try-catch-finally flow 9 ...
A set of Java annotations which can be used in JVM-based languages. They serve as an additional documentation and can be interpreted by IDEs and static analysis tools to improve code analysis.