Comprehensive Java from fundamentals to interview mastery — OOP, Collections, Generics, Streams, Concurrency, Design Patterns, and Modern Java (8–21). Everything you need for Java developer roles.
1-month free Pro trial included
Data types, variables, operators, control flow, and the JVM execution model
Master object-oriented programming — classes, constructors, access modifiers, static vs instance, and the Builder pattern
Master extends, implements, abstract classes, interfaces, and how polymorphism enables flexible design
Master List, Set, Map, Queue — their implementations, performance characteristics, and when to use each
Master Java's exception hierarchy, checked vs unchecked exceptions, try-with-resources, and custom exceptions
Write type-safe reusable code with generics, transform data elegantly with the Stream API, and master Java 8+ functional programming
Threads, synchronization, volatile, locks, and the java.util.concurrent toolkit — essential for backend interviews
Implement Singleton, Factory, Observer, Strategy, and other GoF patterns — essential for architecture interviews
Java 8 through 21 features: records, sealed classes, text blocks, pattern matching, and Virtual Threads
The most common Java interview questions — memory model, JVM internals, String pool, and 50 Q&A covering everything
