Junior Java Developer Questions

Shared by steffi mueller

52 cards Subject: Language Updated: Jun 2, 2026

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[Core Java] What is the difference between JDK, JRE, and JVM?

JDK (Java Development Kit) is for development, includes compiler and tools. JRE (Java Runtime Environment) is for running Java programs. JVM (Java Virtual Machine) executes bytecode.

[Core Java] What is a class and an object in Java?

A class is a blueprint for objects. An object is an instance of a class.

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