beginner · cohort
Java 21 Language Core Intensive
Syntax refresh, records, pattern matching, and virtual threads with weekly mentor reviews on your exercises.
6 weeks · 8h/week
JPY 98,000
Informational rate—final fees appear on your enrollment agreement.
Request information Money-back policyProgram narrative
A structured path through modern Java syntax and APIs. You will ship small CLI utilities and refactor legacy snippets using records, sealed types, and structured concurrency previews where appropriate. Mentors annotate pull requests in a private repository so feedback stays tied to real code.
What ships in the box
- Sequenced labs from bytecode basics to modern switch patterns
- Office hours focused on reading JDK release notes critically
- Pair debugging sessions on NullPointerException traces
- Checkstyle and Spotless templates aligned to hiring rubrics
- Two capstone micro-modules you can show in interviews
- Office templates for documenting design decisions
- Access to annotated solutions after your first attempt
Outcomes you can describe
- Explain language choices using JDK documentation, not blog summaries
- Refactor nested conditionals into readable pattern matching
- Prepare a short talk on one Java 21 feature for your portfolio
Lead mentor
Mika Okada
Lead instructor; former platform engineer shipping JVM services in Osaka.
Cohort questions
Comfort with any C-style language helps. We do not teach programming from zero; orientation week points you to primers if you are rusty.
Yes, recordings stay available for 90 days. Peer labs are not recorded to keep discussions candid.
Certification exam vouchers, employer reimbursement paperwork, and 1:1 career coaching outside the two bundled sessions.
Experience notes
Week four on virtual threads finally made thread dumps click—I reused the mentor’s annotation style on my team’s repo the next sprint.
Clear labs, though the module on sealed classes felt dense. The office-hour whiteboard notes compensated.