Java interview quizzes

AWS Basics for Java Interviews

Core AWS services, IAM, and deployment patterns that Java backend candidates are commonly asked.

Collections

1 quiz

Java Collections Framework

Lists, sets, maps, queues, iterators, and complexity trade-offs for interviews.

Core Java

1 quiz

Core Java Fundamentals

Interview-focused coverage of Java language basics, types, operators, and core APIs.

Design Patterns

1 quiz

Design Patterns in Java

GoF and enterprise patterns frequently tested in Java backend interviews.

Exceptions

1 quiz

Quiz ⏱ 20 min

Java Exceptions and Error Handling

Checked vs unchecked exceptions, try-with-resources, and robust error-handling patterns.

Garbage Collection

1 quiz

Java Garbage Collection Deep Dive

GC algorithms, generations, roots, and tuning concepts for JVM interview rounds.

Hibernate / JPA

1 quiz

Hibernate and JPA

Entities, relationships, fetching, transactions, and common JPA/Hibernate interview pitfalls.

Java 8

1 quiz

Java 8 Features

Lambdas, streams, Optional, functional interfaces, and Java 8 APIs for interviews.

Java DSA

1 quiz

Java DSA Interview Drill

Arrays, hashing, trees, complexity, and classic algorithm patterns asked in Java coding rounds.

Java I/O & NIO

1 quiz

Java I/O and NIO Interview Quiz

Streams, readers, NIO channels, buffers, and file APIs commonly tested in Java interviews.

JVM Internals

1 quiz

JVM Internals

Memory areas, GC basics, classloading, and JIT concepts commonly asked in interviews.

Kafka

1 quiz

Apache Kafka Fundamentals

Topics, partitions, consumer groups, delivery semantics, and Kafka interview essentials.

Microservices

1 quiz

Microservices Architecture

Service decomposition, communication, resilience, and distributed-system patterns for interviews.

Multithreading

1 quiz

Java Multithreading and Concurrency

Threads, locks, volatiles, executors, and concurrent collections for backend interviews.

OOP Concepts

1 quiz

OOP Concepts in Java

Encapsulation, inheritance, polymorphism, abstraction, and SOLID-related interview questions.

REST API

1 quiz

REST API Interview Essentials

HTTP methods, status codes, idempotency, and API design topics for Java service interviews.

Spring Boot

1 quiz

Spring Boot Fundamentals

Auto-configuration, starters, actuators, profiles, and common Spring Boot interview topics.

Spring Security

1 quiz

Spring Security

Authentication, authorization, filters, JWT, and common Spring Security interview topics.

SQL & Database

1 quiz

SQL and Database Fundamentals

Indexing, transactions, normalization, and SQL query concepts for backend interviews.

System Design

1 quiz

System Design for Backend Interviews

Scalability, caching, consistency, queues, and high-level design trade-offs for Java backends.

Miscellaneous

10 quizzes

Mixed Java Backend Warmup

Junior-friendly mix of Core Java, Collections, and SQL fundamentals for early screening rounds.

Quiz ⏱ 35 min

Mixed Senior Interview Round

Harder Spring, concurrency, and design questions typical of senior Java backend interviews.

Mixed Product Company Screen

Tricky code output, equals/hashCode contracts, and Stream API questions for product-company screens.

Mixed Service Company Screen

Spring Boot, JPA, and SQL join questions commonly asked in service-company Java interviews.

Mixed Code Output Tricky

Mostly code-snippet and output-prediction questions that trip up Java interview candidates.

Quiz ⏱ 20 min

Mixed True False Rapid

Mostly true/false rapid fire across the Java ecosystem with a few singles mixed in.

Mixed Spring Ecosystem

Spring Boot, Security, Data, and Actuator topics for full Spring stack interview prep.

Mixed Data and SQL

SQL, indexing, transactions, and JPA fetching strategies for data-layer interviews.

Quiz ⏱ 35 min

Mixed Architecture and Design

System design, patterns, and microservices tradeoffs for architecture-focused Java interviews.

Quiz ⏱ 35 min

Mixed Full Stack Java Prep

Broad final-revision mix covering Java, Spring, SQL, and light DSA for interview day.