Track summary

You covered Java from JVM basics through OOP, collections, exceptions, modern APIs, and production context. The playground taught compiled workflows; real projects add Maven/Gradle, tests, and frameworks like Spring Boot.

What you can do now

• Write typed classes with encapsulation, inheritance, and interfaces
• Use ArrayList, HashMap, streams, Optional, and records appropriately
• Handle exceptions and explain checked vs unchecked trade-offs
• Discuss JDBC, build tools, and Spring at interview depth

Suggested next steps

• Build a CLI or REST CRUD locally with Spring Initializr
• Revisit JavaScript for front-end pairing or PHP to compare dynamic vs static backends
• Practice lesson MCQs until scores are consistently strong

Important interview questions and answers

1. Q: Summarize Java in one sentence for an interviewer?
   A: A statically typed, JVM-based language with strong OOP and ecosystem support for enterprise APIs, batch jobs, and Android-era backends.
2. Q: Biggest mindset shift from JavaScript/PHP?
   A: Types and compilation catch errors early; everything lives in classes with explicit contracts.

Self-check

1. Which topic do you want to deepen first—collections, concurrency, or Spring?
2. Can you write a Main class from memory?