Practice path · 3 games

Java Concurrency

Practice Java memory visibility, synchronization, executor admission, cancellation, virtual threads, and incident reasoning.

For Java backend engineers operating concurrent services under real capacity limits.

Java Advanced

Protect Java visibility, compound invariants, atomic updates, and lock ordering.

Java Advanced

Bound executor admission, compose failures, and stop work after deadlines.

Java Advanced

Operate virtual threads, structured child tasks, scoped context, and pinning evidence.