Junior Java Developer Questions

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Last updated Jun 2, 2026

[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.

[Core Java] Explain the 'public static void main(String[] args)' method.

It's the entry point of a Java application. public: accessible, static: no instance needed, void: no return, main: name, String[] args: command line arguments.

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