Java Lab:

This repo contains Java features and advanced concepts from Java 7 and above.
Each feature has its own folder with a code file and README explaining the concept.

Table of Contents

Java 7

• Try-with-resources
• Diamond Operator
• Multi-catch Exceptions
• NIO.2 Examples

Java 8

• Lambda Expressions
• Streams API
• Optional
• Date/Time API

Java 9

• Modules

Java 10

• Var

Java 11

• HttpClient

Java 12

• Switch Expressions

Java 13

• Text Blocks

Java 16

• Records

Java 17

• Sealed Classes

Java 21

• Virtual Threads

Advanced / Concurrency

• CompletableFuture
• Concurrent Collections
• ForkJoinPool
• Callbacks (Legacy Patterns)
  • Synchronous & Asynchronous Callbacks
• Locking Mechanisms
  • Mutex (Synchronized, ReentrantLock)
  • ReentrantReadWriteLock
  • StampedLock
  • OptimisticLocking
  • Semaphore
  • CountDownLatch
  • CyclicBarrier
  • Phaser
  • LockSupport

JVM & Memory (Advanced)

• JVM Memory Areas (Heap, Stack, Metaspace)
• Java Memory Model (JMM)
• Happens-Before Relationship
• volatile vs synchronized
• Garbage Collection Basics (G1, ZGC)
• Escape Analysis
• False Sharing

Core Java – Object Copying

• Shallow Copy
• Deep Copy

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How to Use

1. Navigate to a feature folder.
2. Read the README.md to understand the concept.
3. Run the .java file to see the example in action.
4. Experiment and modify to deepen understanding.