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Core Java Mastery (Java 22)

This module is now fully available. Use this page as your roadmap: what you will learn, how the study plan is structured, and where to find guided day-by-day deep dives.

Learning outcomes

  • Design robust domain models with records, sealed hierarchies, and immutability.
  • Apply modern concurrency (virtual threads, structured concurrency patterns) safely.
  • Profile CPU/memory hotspots and fix performance regressions with JVM tooling.
  • Ship production-grade Java code with testing, observability, and secure defaults.

Study plan

Week 1Language evolution, OOP refresh, collections, generics, exceptions.
Week 2Records, sealed classes, pattern matching, streams, functional style.
Week 3Concurrency, virtual threads, synchronization, executors, resilience.
Week 4JVM internals, GC strategy, performance profiling, advanced testing.
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