Java — Zero to Hero

A complete, hands-on Java journey from your first JDK install to shipping an idiomatic, tested, concurrent command-line application. Built on Java 25 (LTS), it mixes prose, runnable code, MCQ checks, output-prediction drills, ordering and matching activities, an embedded JShell sandbox, environment checklists, and mentor-chat prompts so every skill is rehearsed in the format that fits it best.

9 modules · 27 lessons

27 lessons

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The route

9 modules · Outline open to everyone

1
1. Locked, start the course to open it. Install the JDK and verify it works8 min
2. Locked, start the course to open it. JShell and your first program10 min
3. Locked, start the course to open it. Editors and build tools10 min
2
1. Locked, start the course to open it. Variables, primitives, and references10 min
2. Locked, start the course to open it. Strings and text12 min
3. Locked, start the course to open it. Operators, autoboxing, and conversions10 min
3
1. Locked, start the course to open it. if/else and loops8 min
2. Locked, start the course to open it. switch, the modern way8 min
3. Locked, start the course to open it. Pattern matching & iteration10 min
4
1. Locked, start the course to open it. Defining methods, overloading, varargs10 min
2. Locked, start the course to open it. Parameter passing and scope10 min
3. Locked, start the course to open it. Lambdas, functional interfaces, method references10 min
5
1. Locked, start the course to open it. List, Set, Map, and generics8 min
2. Locked, start the course to open it. Generics deeper and Optional8 min
3. Locked, start the course to open it. Streams8 min
6
1. Locked, start the course to open it. Classes, encapsulation, inheritance8 min
2. Locked, start the course to open it. Interfaces, records, enums, sealed8 min
3. Locked, start the course to open it. equals, hashCode, and modeling in practice8 min
7
1. Locked, start the course to open it. Exceptions12 min
2. Locked, start the course to open it. try-with-resources & files (NIO.2)10 min
3. Locked, start the course to open it. Logging8 min
8
1. Locked, start the course to open it. JUnit 5 basics8 min
2. Locked, start the course to open it. Parameterized tests and JavaDoc6 min
3. Locked, start the course to open it. Build and quality tools8 min
9
1. Locked, start the course to open it. Standard library tour10 min
2. Locked, start the course to open it. Concurrency and virtual threads8 min
3. Locked, start the course to open it. Capstone: concurrent URL health-checker CLI10 min
Certificate of completion
+5 XPShareableAnyone can verify
After all 27