Level Up Your Java Skills with Targeted Exercises – Master the Power of Java in This Ultimate Mega Pack!
This course takes you on a journey from foundational Java programming to expert-level skills, equipping you to design efficient, scalable, and maintainable software. Through hands-on exercises, real-world scenarios, and best practices, you’ll gain practical expertise in:
Java Core Concepts
Object-Oriented Programming (OOP)
Classes, objects, and constructors.
Method overriding and overloading.
Inheritance, polymorphism, and encapsulation.
Abstract classes and interfaces.
Generics
Implementing generic data structures (e.g., LockFreeStack<T>).
Using bounded type parameters.
Collections Framework
Using HashMap, LinkedHashMap, ConcurrentHashMap, Queue, and List.
Working with thread-safe collections.
Exception Handling
Handling checked and unchecked exceptions (IOException, InterruptedException, RuntimeException).
Using try-catch-finally and custom exception messages.
Concurrency and Multithreading
Thread Safety
Synchronization with synchronized blocks and methods.
Thread-safe data structures like AtomicReference and ConcurrentHashMap.
Advanced Concurrency Mechanisms
Non-blocking algorithms (e.g., LockFreeStack with Compare-And-Swap).
Blocking queues with wait() and notifyAll().
Executor Framework
Using ExecutorService, ScheduledExecutorService, and thread pools.
Task scheduling with fixed-rate and fixed-delay jobs.
Volatile and Atomicity
volatile for visibility across threads.
Atomic operations with AtomicInteger and compareAndSet.
Double-Checked Locking
Implementing thread-safe singletons with minimal synchronization overhead.
Data Structures and Algorithms
Custom Data Structures
LRU Cache using LinkedHashMap.
Lock-free stack with CAS.
Thread-safe bounded blocking queues.
Algorithmic Patterns
Implementing Least Recently Used (LRU) cache eviction.
Designing memory-efficient and high-performance ID generators (Snowflake-inspired).
Advanced Design Patterns
Singleton
Thread-safe Singleton with lazy initialization and double-checked locking.
Publish-Subscribe (Pub/Sub)
Implementing a messaging system with topics and subscribers.
Dependency Injection (DI)
Lightweight DI container for automatic dependency resolution.
Event-Driven Architectures
Custom event loops for asynchronous task execution.
Distributed Systems
Distributed ID Generators
Time-ordered unique IDs using timestamp, machine ID, and sequence numbers.
Fault Tolerance
Implementing Circuit Breaker patterns to handle service failures gracefully.
Performance Optimization
Lazy Initialization
Optimizing resource creation to defer initialization until necessary.
Non-Blocking Synchronization
Using CAS for high-performance, lock-free data structures.
Rate Limiting
Token Bucket algorithm for throttling API requests.
I/O and Serialization
Custom Serialization Framework
Using reflection for object serialization and deserialization.
File Processing
Multi-threaded processing of large files with efficient chunking.
Testing and Debugging
Unit Testing
Writing JUnit 5 tests for validating implementation correctness.
Testing thread safety and concurrency.
Error Handling
Gracefully managing system errors and preventing cascading failures.
Real-World Applications
Scalable Caches
Designing LRU caches for performance-critical applications.
Distributed Systems
Unique ID generators for large-scale distributed applications.
Circuit breakers for microservices.
Task Scheduling
Implementing schedulers for periodic and delayed tasks.
Messaging Systems
Publish-Subscribe patterns for decoupled communication.
Key Skills Practiced
Designing and implementing thread-safe systems.
Understanding and applying advanced synchronization techniques.
Building scalable, fault-tolerant, and performant solutions.
Applying real-world design patterns and best practices.