Advanced
Advanced concurrency (CompletableFuture, ReentrantLock, atomic variables, concurrent collections, ForkJoin), design patterns (creational, structural, behavioral, SOLID), reflection and annotations, dynamic proxies, type erasure, advanced streams, NIO buffers and channels, Java Memory Model, pattern matching for switch, virtual threads, and structured concurrency.
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Advanced Concurrency
CompletableFuture
Compose asynchronous pipelines with CompletableFuture for non-blocking concurrent code.
ReentrantLock and Conditions
Use ReentrantLock and Condition for fine-grained thread synchronization beyond synchronized blocks.
Atomic Variables
Use AtomicInteger, AtomicLong, and AtomicReference for lock-free thread-safe operations.
Concurrent Collections
Use ConcurrentHashMap, CopyOnWriteArrayList, BlockingQueue, and other thread-safe collections.
ForkJoin Framework
Divide and conquer large tasks in parallel using ForkJoinPool, RecursiveTask, and parallel streams.
Design Patterns
Creational Design Patterns
Implement Singleton, Factory Method, Abstract Factory, and Builder patterns in Java.
Structural Design Patterns
Implement Adapter, Decorator, Proxy, and Composite patterns to compose objects and classes.
Behavioral Design Patterns
Implement Observer, Strategy, Command, and Template Method patterns for flexible object behavior.
SOLID Principles
Apply the five SOLID principles to write maintainable, extensible, and testable Java code.
Reflection and Metaprogramming
Reflection API
Inspect and manipulate classes, fields, and methods at runtime using the Java Reflection API.
Custom Annotations
Define and process custom annotations with annotation processors and the Reflection API.
Dynamic Proxies
Create runtime proxies with java.lang.reflect.Proxy to implement cross-cutting concerns like logging and timing.
Advanced Streams
Modern Java
Pattern Matching for Switch
Use switch expressions with type patterns, guarded patterns, and deconstruction for expressive dispatch logic.
Virtual Threads
Use Java 21 virtual threads for massive concurrency with blocking code, without the overhead of OS threads.
Structured Concurrency
Manage groups of concurrent tasks with StructuredTaskScope for reliable cancellation and error propagation in Java 21+.