31 structured modules with practical code examples, tests, and hands-on tasks. From primitive types to virtual threads — everything in one place.
Click any module to mark it complete. Recommended order for progressive learning.
Module progress (left) and tasks solved (right). Saved locally in your browser.
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| ✓ | Module | Description | Tags | Java | README | ✦ Tasks |
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Common interview topics, organized by category. Click to expand.