Java interview prep · MCQ format · Explained answers

Java Interview Question Bank

Practice quizzes organized by experience level — from Fresher basics to Senior-level concurrency, JVM internals, and system design.

3247Quizzes
36249+Questions
3Levels

Pick your level

Fresher, Mid-level, or Senior — jump straight to what matters for your interviews.

Take timed quizzes

MCQ format under time pressure — exactly how coding tests work.

Learn from mistakes

Every wrong answer shows a plain-English explanation so you actually understand it.

Select your experience level

Fresher — 0 – 2 years

Core Java, OOP fundamentals, and basic data structures — the foundation of every Java interview.

Java Fundamentals

5 quizzes · 100 questions

Beginner

Java Variables & Data Types

Test your understanding of Java primitive types, variables, type casting, and memory basics.

25 min20q70% to pass
Beginner

Java Operators & Control Flow

Master Java operators, if/else, switch statements, and loops with practical examples.

25 min20q70% to pass
Beginner

Java Strings

Deep dive into Java String manipulation, immutability, StringBuilder, and common String methods.

25 min20q70% to pass
Beginner

Java Arrays

Learn Java arrays — declaration, initialization, traversal, sorting, and multi-dimensional arrays.

25 min20q70% to pass
Beginner

Java Classes & Objects

Understand how to create classes, instantiate objects, use constructors, and work with the this keyword.

25 min20q70% to pass

Object-Oriented Programming

5 quizzes · 100 questions

Beginner

Java Access Modifiers

Master public, protected, default, and private access modifiers, their scope, and best practices for controlling visibility in Java.

20 min20q70% to pass
Beginner

Java Encapsulation

Test your understanding of encapsulation, getters/setters, data hiding, immutability, and JavaBeans conventions in Java.

20 min20q70% to pass
Beginner

Java Inheritance

Test your understanding of Java inheritance, superclasses, subclasses, method overriding, and the super keyword.

25 min20q70% to pass
Intermediate

Java Polymorphism

Master compile-time and runtime polymorphism, method overloading, dynamic dispatch, and casting in Java.

25 min20q70% to pass
Intermediate

Java Abstraction & Interfaces

Test your knowledge of abstract classes, interfaces, default methods, functional interfaces, and design with abstraction in Java.

25 min20q70% to pass

Collections Basics

2 quizzes · 40 questions

Beginner

Java ArrayList

Test your knowledge of ArrayList: creation, manipulation, iteration, performance characteristics, and common pitfalls.

25 min20q70% to pass
Intermediate

Java HashMap

Test your knowledge of HashMap: hashing, collisions, key-value operations, null handling, iteration, and performance.

25 min20q70% to pass