Top Java Interview Questions and Answers TO GET YOU HIRED in 2026
1. What is Java? Answer: Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems (now Oracle). Java follows the principle "Write Once, Run Anywhere (WORA)" because Java programs run on the JVM. 2. What are the main features of Java? Answer: Platform Independent Object-Oriented Robust Secure Multithreaded High Performance (with JIT Compiler) Distributed Portable Automatic Garbage Collection 3. What is JVM? Answer: JVM (Java Virtual Machine) is responsible for executing Java bytecode. It converts bytecode into machine code and provides platform independence. 4. Difference between JDK, JRE, and JVM? JDK JRE JVM Development Kit Runtime Environment Virtual Machine Includes JRE + Tools Includes JVM + Libraries Executes Bytecode Used by Developers Used by Users Runs Java Programs 5. What is Object-Oriented Programming (OOP)? Answer: OOP is a programming paradigm based on objects and classes. The four pillars are: Encapsulatio...