Free Course — No signup required

Learn Enterprise Backend
in 5 Days

OOP fundamentals that transfer to every language. Spring Boot APIs. Database access with JDBC.

5 lessons
Self-paced
~60 min/day
Free forever
No account needed
Start Day 1 — Free → See what's covered
What you'll learn

Java in 5 Days

Free 5-day Java course. OOP, collections, Spring Boot REST APIs, JDBC database access, and deploying Java applications.

  • Write Java classes, inheritance, and interfaces confidently
  • Use the Collections framework: List, Map, Set effectively
  • Build a REST API with Spring Boot in under an hour
  • Connect to a database using Spring Data JPA
  • Write unit tests with JUnit and Mockito
  • Package and deploy a Spring Boot application as a JAR or Docker container
JVM
platform
Spring
Boot
5
lessons
$0
cost
5-Day Curriculum

Every lesson has a real exercise.
No theory without practice.

01
Java OOP Fundamentals
Classes, objects, inheritance, interfaces, polymorphism
OOPinheritanceinterfaces
→
02
Collections & Streams
List, Map, Set, Java Streams, lambda expressions
CollectionsStreamslambdas
→
03
Spring Boot REST API
Spring Boot setup, controllers, services, request/response
Spring BootRESTcontrollers
→
04
Database with Spring Data JPA
Entities, repositories, JPQL, H2 + PostgreSQL
JPAentitiesrepositories
→
05
Testing & Deployment
JUnit 5, Mockito, Maven build, Docker, JAR deployment
JUnitMockitoDocker
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems at scale. This course is practical first — every lesson has code you can run and an exercise you can finish in under an hour.

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