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Hands-on tutorials

Learn Java by doing, not just reading.

Skolarli Java tutorials are hands-on, step-by-step walkthroughs you can follow and run. Each one answers a single concrete question, shows the working code, and explains the tradeoffs.

3 tutorials·Beginner to advanced·updated weekly

General

JavaBeginner

Top Java Coding Interview Questions (With Answers)

Top Java Coding Interview Questions (With Answers)

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General

JavaIntermediate

Java Collections Framework Interview Questions

Java Collections Framework Interview Questions

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General

JavaIntermediate

Java OOP Interview Questions (With Code Examples)

This tutorial gives readers a working command of the Java OOP questions that come up most in interviews — encapsulation, inheritance vs composition, polymorphism, interfaces vs abstract classes, and the equals()/hashCode() contract — backed by runnable code rather than bare definitions. It also walks readers through the mistakes that trip up most candidates, like assuming overloading resolves the same way overriding does, so they can recognize the trap before it costs them an offer.

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How these Java tutorials are built

Every tutorial opens with a direct answer to the question in its title, then walks through the working solution step by step. Code you can copy sits in a syntax-highlighted block. Tutorials that belong to a series are ordered from beginner to advanced so you can follow a path rather than hunt for the next piece.

Looking to sharpen judgment rather than complete a task — interviews, career moves, what to look for when applying? Those live in Guides.

For hiring & L&D teams

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These tutorials are also where teams come to shape their question banks. If you're putting together coding assessments, technical screens, or a question library for hiring or training, Skolarli's assessment platform does it at scale — with proctoring and integrity built in. Tell us what you're assessing for.