Java Fundamentals

Understand Java's architecture, platform independence via the JVM, and set up a professional development environment with JDK 17+, IntelliJ IDEA, and your first compiled program.

Master Java's complete type system including all eight primitive types, their wrapper class counterparts, widening and narrowing conversions, autoboxing pitfalls, and variable scoping rules.

Master all Java operator categories, write clear conditional logic with if-else and switch expressions, and control iteration with for, while, do-while, and enhanced for-each loops.

Master Java arrays including multi-dimensional arrays and the Arrays utility class, and gain deep understanding of String immutability, StringBuilder, and the 20 most commonly used String methods.

Master Java class design with constructors, encapsulation using private fields and public accessors, method overloading, static members, and the this keyword to build well-structured objects.

Master Java inheritance using extends and super, implement runtime polymorphism through method overriding, and apply the Liskov Substitution Principle to build extensible class hierarchies.

Master abstraction in Java by choosing correctly between abstract classes and interfaces, implementing multiple interfaces, using default methods, and designing flexible APIs with sealed types.

Master Java exception handling with try-catch-finally, checked versus unchecked exceptions, multi-catch, try-with-resources, and designing custom exception hierarchies for robust production code.

Master Java's NIO.2 API for reading, writing, and managing files and directories using Path, Files, and Streams, with proper resource management and real-world data processing patterns.

Master the Java Collections Framework — List, Set, Map, and Queue interfaces with their implementations — and choose the right data structure for every use case based on performance characteristics.