Skip to content
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

object

A value with its own data and methods, kept in memory and reached through a reference.

An object is an instance of a class, stored on the JVM's heap, with state and methods invoked through a reference.

Read the full section →