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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

JDK

The kit you install to write and run Java, with the compiler, the JVM, and tools.

A Java Development Kit is an implementation of Java SE that bundles the JVM, the standard library, and development tools such as javac, java, jshell, jar, and jlink.

Examples

  • javac -version and java -version both print the JDK's version, such as 25.0.4.

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