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01: Can you design classes & interfaces using OO?

Q1. How would you go about designing a “farm animals” application where animals like cow, pig, horse, etc move from a barn to pasture, a stable to paddock, etc? The…

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01: Q13 “12 Rules” for REST API design & development

These are more like rules to develop RESTFul web services as opposed to being the best practices. REST is an architectural style without any contracts or specifications. So, it is…

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02: Scenarios based Java OO concepts & GoF design patterns – naive Template Method pattern

Scenarios based Java OO concepts & GoF design patterns

03: Scenarios based Java OO concepts & GoF design patterns – Strategy Pattern

The following post improves on the design flaws listed in the previous post entitled 02: Scenarios based Java OO design & GoF design patterns – naive Template Method pattern. Scenario:…

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05: Q19-Q24 How to create a well designed Java application?

A software application is built by coupling various classes, modules, and components. Without coupling, you can’t build a software system. But, the software applications are always subject to changes and…

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06: Q25 – Q32 Design principles interview questions & answers for Java developers

Design principles interview questions & answers for Java developers so that you can expand your OOP skills to design robust Java apps Q25. What are the SOLID design principles? A25….

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6 tips to go about writing loosely coupled Java applications

6 tips to go about writing loosely coupled Java applications useful not only for talking the talk in Java job interviews, but also to build maintainable Java applications. Loose coupling in microservice architecture means microservices should know little about each other, and any change to one service should not affect the others.…


Class invariant & designing by contract in Java

Q1. What is a class invariant? A1. Class invariant is — what must be true about each instance of a class? If an invariant fails then there could be a…

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How would you go about designing with UML diagrams

This extends 12 UML Interview Questions & Answers. Q1. How would you go about designing a system as described below? A barn that contains animals such as cows and horses….

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Part 1: Badly designed Java classes & interfaces

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. Q. Can you…

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800+ Java & Big Data Interview Q&As

300+ Java Interview FAQs
Java FAQs - 01: Prepared?
Java FAQs - 02: Ice Breaker
Java FAQs - 03: Core Java
Java FAQs - 04: OOP & FP
Java FAQs - 05: JEE
Java FAQs - 06: Spring
Java FAQs - 07: Hibernate
Java FAQs - 08: Web Services
Java FAQs - 09: Microservices
Java FAQs - 10: Messaging
Java FAQs - 11: Architecture
Java FAQs - 12: RDBMS
Java FAQs - 13: SQL
Java FAQs - 14: Code Quality
Java FAQs - 15: Key Areas
Java FAQs - 16: UML
Java FAQs - 17: GIT
Java FAQs - 18: Unix
Java FAQs - 19: DevOps (CI/CD)
Java FAQs - 20: AWS (Cloud)
Java FAQs - 21: Maven
Java FAQs - 22: Regex
Java FAQs - 23: JSON & XML
Java FAQs - 24: JMeter
300+ Big Data Interview FAQs
Big Data - 00: Roadmap
Big Data - 01: SQL
Big Data - 02: Data Modelling
Big Data - 02: Data Warehouse
Big Data - 03: Distributed Systems
Big Data - 04: Hadoop
Big Data - 05: MapReduce
Big Data - 06: Hive
Big Data - 07: Impala
Big Data - 08: Spark
Big Data - 09: Databricks
Big Data - 09: Spark SQL
Big Data - 10: Apache Kafka
Big Data - 11: Data Governance
Big Data - 11: NoSQL
Big Data - 12: Data security
Big Data - 13: Analytics & Science
Big Data - 14: AWS
Big Data - 15: Sqoop & Nifi
Big Data - 16: Yarn, Zookeeper
16+ Java Key Areas Q&As
Key Area - Going places
Key Area - Ice Breaker
Key Area - Design Concepts
Key Area - Judging Experience
Key Area - Best Practices
Key Area - Concurrency Mgmt
Key Area - Low Latency
Key Area - CI/CD & DevOps
Key Area - Debugging
Key Area - Debug Hibernate
Key Area - Debug Java
Key Area - Debug JEE
Key Area - Debug Spark
Key Area - Debug Spring
Key Area - Design Patterns
Key Area - GoF Design
Key Area - JEE Design
Key Area - Microservices patterns
Key Area - Exception Handling
Key Area - Memory Mgmt
Key Area - Performance
Key Area - Scalability
Key Area - SDLC
Key Area - Security
Key Area - Productivity Tools
Key Area - Transaction Mgmt
Key Area - QoS & SLAs
300+ Core Java Interview Q&As
Core Java - Overview
Core Java - Data types
Core Java - Constructors
Core Java - Reserved Key Words
Core Java - Classes
Core Java - Objects
Core Java - OOP
Core Java - GC
Core Java - Generics
Core Java - FP
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Core Java - I/O
Core Java - Multithreading
Core Java - Data Structures
Core Java - Annotations
Core Java - AOP
Core Java - Other
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Core Java - Differences X & Y
Core Java - Event Driven
Core Java - Exceptions
Core Java - Java 7
Core Java - Java 8
Core Java - JVM
Core Java - Reactive Program
Core Java - Swing & AWT
Core Java - Understanding
300+ Enterprise Java Interview Q&As
JEE - Overview
JEE - Web basics
JEE - Web Services
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JEE - JTA
JEE - API Design
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JEE - Other
150+ Spring & Hibernate FAQs
Framework - Hibernate Q&As
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Framework - Spring Config
150+ Java Architect interview FAQs
Architecture - Patterns
Architecture - How to
Architecture - AWS
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Architecture - Microservices
Architecture - QoS
Architecture - ERD
Architecture - ETL
Architecture - Low Latency
Architecture - UML
100+ Companion Tech Q&As
16: Angular JS interview Q&As
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13: FIX interview Q&As
03: Git & SVN interview Q&As
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04: JavaScript interview Q&As
11: JMeter interview Q&As
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09: NoSQL Interview Q&As
05: Regex Interview Q&As
01: SQL Interview Q&As
02: Unix interview Q&As
07: JSON interview Q&As
06: XML Interview Q&As
15: XSD Interview Q&As
14: YAML interview Q&As
250+ Scala Interview FAQs
Scala 140+ FAQs
Scala way of coding
200+ Python interview FAQs
80+ Java code quality Q&As
Code Quality - Automation
Code Quality - Code Coverage
Code Quality - FAQs
Code Quality - Profiling
Code Quality - Performance Test
Code Quality - Unit Testing
Code Quality - BDD
Code Quality – Testing DAOs
Code Quality – JUnit, Mockito & Spring
Code Quality – JUnit Web
Code Quality - Spring TXN
100+ Java coding interview Q&As
Coding - Can you write code?
Coding - Complete the code
Coding - Converting from A to B
Coding - Designing your classes
Coding - Data Structures
Coding - Arrays
Coding - Big O notation
Coding - Graph Structure
Coding - LinkedList Structure
Coding - Map Structure
Coding - Pointer Algorithms
Coding - Queue Structure
Coding - Searching Algo
Coding - Sorting Algo
Coding - Stack Structure
Coding - Tree structure
Coding - Data Which & Why
Coding - Passing the unit tests
Coding - What is wrong?
Coding - Home Assignments
Coding - Written Test Core Java
Coding - Written Test JEE

200+ Java & Big Data Tutorials

Tutorials - Big Data
TUT - ⏯ Starting Big Data
TUT - Starting Spark & Scala
TUT - Starting with Python
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TUT - File Formats
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TUT - Flume
TUT - Hadoop (HDFS)
TUT - HBase (NoSQL)
TUT - Hive (SQL)
TUT - Hadoop & Spark
TUT - MapReduce
TUT - Spark and Scala
TUT - Spark & Java
TUT - PySpark on Databricks
TUT - Zookeeper
Tutorials - Enterprise Java
TUT - ⏯ Starting with Java
TUT - Diagnosis
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TUT - Akka Scala
TUT - Akka Java
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TUT - CI/CD Jenkins
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TUT - Java Beginner
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TUT - CSV and Java
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TUT - SQL
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TUT - Unix
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TUT - YAML
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