Learn Java
Oracle / OpenJDK · Beginner · Documentation
Free learning material; certificates and service usage are not included. Link checked 2026-10-02.
Open resource ↗BUILD A SKILL / ONE STEP AT A TIME
Java
Java is a typed general-purpose language.
Why is it useful?
It is widely used for backend and enterprise software.
Prerequisites
No specific prerequisite. Start with the linked introduction.
What should I learn?
- Classes
- Interfaces
- Collections
- Exceptions
- Streams
- Testing
Practice milestone
Build a tested library management CLI.
A REALISTIC PRACTICE PLAN
70–140 focused hours
Beginner · approximately 7.0–14.0 weeks at 10 hours/week.
This is an editorial estimate for the listed foundations and exercises, not a promise of mastery. Familiarity comes earlier; practical confidence requires repeated projects. Strong proficiency often takes months or years of continued use.
At 1–2 hours/day, missed days and revisiting prerequisites extend calendar time. Skills can be studied together.
Your learning progress
Self-reported completion does not change your saved analysis or prove proficiency.
Curated learning resources
FREE LEARNING FIRSTCareer recommendations and learning timelines are educational guidance based on your resume and selected goals. They are not guarantees of employment or professional competency.