Final10 Java Topics You MUST Know in 2025 | Java Roadmap for Beginners

Are you learning Java? Here are the 10 most important Java topics every beginner, student, or job seeker should know!

In this video, we cover the core Java concepts you need for coding, real projects, and interviews — from OOP basics to advanced features.

🟢 Topics Covered:

JDK, JRE, JVM

OOP: Class & Object

Constructors & Overloading

Inheritance & Interfaces

Collections: List vs Set

Generics

Exception Handling: try-catch-finally

Streams & Lambdas

Java 21+ New Features (var, record)

Spring Boot Starter Example

✨ Whether you’re preparing for interviews or building projects, mastering these topics will make you a better Java developer.

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Java topics for beginners
Java roadmap 2025
Java must know topics