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Stage 0
Meet Java
Your first steps - no experience required.
Start from absolute zero. Understand what programming is, what Java is, where it came from, who keeps it alive, and get your machine ready to write your very first program.
5 Lessons in this stage1 h 1 min
Start the first lessonLessons in this stage
- 01
What Is Java?
BeginnerWhat programming means, what Java is, and why it runs everything from Android phones to banks and Netflix.
12 min - 02
The History of Java
BeginnerJames Gosling, the Green Team, Oak becoming Java, and the idea of 'Write Once, Run Anywhere'.
10 min - 03
Who Maintains Java?
BeginnerOracle, OpenJDK, the JCP, JEPs, release cadence, LTS versions, and the vendors that ship Java.
9 min - 04
The Java Ecosystem
BeginnerJDK vs JRE vs JVM, bytecode, the compile-and-run pipeline, and the universe of libraries around Java.
14 min - 05
Setup & Hello, World!
BeginnerInstall a JDK, pick an IDE, and write, compile, and run your very first Java program step by step.
16 min