Home › Archive for Quick Prep Java Interview
Blog Archives
1 2 3 4 5 … 28

0: 20+ SQL best practices & optimisation interview Q&As

SQL Best Practices

SQL is very easy to learn, but lots of hands-on experience is required to master to perform the below tasks.

1) Translating any business requirements into SQL.

2) Writing efficient, readable & maintainable SQL.

3) Breaking down &

…

Read more ›


00: 50+ SQL scenarios based interview Q&As on identifying & deleting duplicate records

DB Fiddle - Practice SQL

50+ SQL interview questions and answers to solve real business scenarios. SQL is widely used in building microservices & Big Data projects. Learning SQL syntax is easy, but being able to convert a given business requirement into a query takes lots of practice. These scenarios based interview questions can assesses your experience.

…

Read more ›


00: Ensuring code quality in Java Q&As

Q1. How do you ensure code quality in your application? A1. Code quality means writing readable, maintainable and robust code, that conforms as much as possible to the style-guideline that is used, and that has as little as possible defects. … Read more ›...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

00: Top 50+ Core Java interview questions & answers – Q01 – Q10

Top 50 core Java interview questions covering core Java concepts with diagrams, code, examples, and scenarios. If you don’t get these Java interview questions right, you will not be getting an offer.

== Vs equals(…)

Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects?

…

Read more ›


00: Top 50+ Core Java interview questions answered – Q11 to Q23

The focus is on Java OOP interview questions and answers. Q11. What is the difference between constructors and other regular methods? A11. Constructors must have the same name as the class name and cannot return a value. The constructors are called only once per creation of an object while regular...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

00: Top 50+ Core Java interview questions answered – Q24 to Q36

Focus is on Java classes, interfaces and generics the interview questions and answers style. Java classes and interfaces are the building blocks. Q24. What happens when a parent and a child class have the same variable name? A24. … Read more ›...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

00: Top 50+ Core Java interview questions answered – Q37 to Q42

As a Java developer, you may not need to know how the JVM works, but the most important topic that you must know is Java Garbage Collection. How the Garbage Collection and object referencing work in Java. Q37. What do you know about the Java garbage collector? … Read more...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

00: Top 50+ Core Java Interview questions answered – Q43 to Q54

Q43. What can you tell about the performance of a HashMap compared to a TreeMap? Which one would you prefer? A43. A balanced tree does have O (log n) performance. The TreeMap class in Java maintains key/value objects in a sorted order by using a red-black tree. … Read more...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

00: Tree from a list & flattening it back to a list in Java

Hierarchical data with parent & child relationships are very common, and Java collection does not have a Tree data structure, hence it is a popular interview question. Further questions include tree data structure processing using recursiion & iteration. A Tree data structure can be represented as shown below.

Step 1: A simple Node.java class that encapsulates its value,

…

Read more ›


01: 12 Maven interview Questions & Answers

Q1. What is the difference between snapshot versions and release versions? A1. The term “SNAPSHOT” means the build is a snapshot of your code at a given time, which means downloading 1.0-SNAPSHOT today might give a different file than downloading it tomorrow or day after. … Read more ›...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

01: 12 Web basics every Java web developer must know – Part 1

Q1. HTTP is a stateless protocol, so how do you maintain state? How do you store user data between requests? A1. This is a commonly asked interview question. The “http protocol is a stateless request/response based protocol”. You can retain the state information between different page requests as follows: HTTP...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

01: 12+ Git Source control must know basics interview Q&As

Q1. How does Git differ from SVN (i.e Subversion)? A1. #1. Git is a distributed source control system meaning that there will be multiple client repositories. SVN is one repository with lots of clients. … Read more ›...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

01: 13 Java low latency interview questions & answers

Trading Execution reports are received and processed asynchronously

Have you seen job advertisements requiring Java candidates to work in low latency, high throughput, real-time and distributed systems with share-nothing architectures? Wondering what questions you will be asked? If you are an experienced Java developer targeting high paying skills then it pays to get a good handle on Java...

This content is for 100-Day-Full-Access, 200-Day-Full-Access, 365-Day-Full-Access, and 2-Year-Full-Access members only. Register 50+ Free Java FAQs 50+ Free Big Data FAQs
Already a member? Log in here

1 2 3 4 5 … 28

300+ Java Interview FAQs

Java Interview FAQs 300+
Java FAQs - 01: Prepared?
(2)
Java FAQs - 02: Ice Breaker
(5)
Java FAQs - 03: Core Java
(15)
Java FAQs - 03 Java versions 9 to 20
(7)
Java FAQs - 04: OOP & FP
(10)
Java FAQs - 05: JEE
(12)
Java FAQs - 06: Spring
(10)
Java FAQs - 07: Hibernate
(4)
Java FAQs - 08: Web Services
(6)
Java FAQs - 09: Microservices
(12)
Java FAQs - 10: Messaging
(4)
Java FAQs - 11: Architecture
(5)
Java FAQs - 12: RDBMS
(2)
Java FAQs - 13: SQL
(6)
Java FAQs - 14: Code Quality
(4)
Java FAQs - 15: Key Areas
(14)
Java FAQs - 16: UML
(1)
Java FAQs - 17: GIT
(4)
Java FAQs - 18: Linux
(3)
Java FAQs - 19: DevOps (CI/CD)
(9)
Java FAQs - 20: AWS (Cloud)
(5)
Java FAQs - 21: Maven
(1)
Java FAQs - 22: Regex
(2)
Java FAQs - 23: JSON & XML
(3)
Java FAQs - 24: JMeter
(2)
Spring & Hibernate FAQs
Framework - Hibernate Q&As
(13)
Framework - Spring Core
(6)
Framework - Spring MVC
(7)
Framework - Spring Cloud
(1)
Framework - Spring boot
(4)
Framework - Spring IO
(1)
Framework - Spring Config
(5)
Java Architect FAQs
Architecture - Patterns
(10)
Architecture - How to
(17)
Architecture - AWS
(10)
Architecture - Azure
(6)
Architecture - Distributed
(8)
Architecture - Microservices
(11)
Architecture - Networking
(6)
Architecture - QoS
(1)
Architecture - ERD
(1)
Architecture - ETL
(3)
Architecture - Low Latency
(6)
Architecture - UML
(1)
Java code quality Q&As
Code Quality - Automation
(1)
Code Quality - Code Coverage
(2)
Code Quality - FAQs
(7)
Code Quality - Profiling
(3)
Code Quality - Performance
(2)
Code Quality - Unit Testing
Code Quality - BDD
(4)
Code Quality - JMockit
(15)
Code Quality - Mockito
(4)
Code Quality - Unit Testing FAQs
(3)
Code Quality – Testing DAOs
(4)
Code Quality – JUnit & Mockito
(6)
Code Quality – JUnit Web
(2)
Code Quality - Spring TXN
(2)
Java coding Q&As
Coding - Can you write code?
(22)
Coding - Complete the code
(13)
Coding - Converting from A to B
(6)
Coding - Designing your classes
(9)
Coding - Data Structures
Coding - Arrays
(2)
Coding - Big O notation
(2)
Coding - Graph Structure
(2)
Coding - LinkedList Structure
(2)
Coding - Map Structure
(1)
Coding - Pointer Algorithms
(3)
Coding - Queue Structure
(1)
Coding - Searching Algo
(1)
Coding - Sorting Algo
(4)
Coding - Stack Structure
(1)
Coding - Tree structure
(14)
Coding - Data Which & Why
(2)
Coding - Passing the unit tests
(5)
Coding - What is wrong?
(10)
Coding - Home Assignments
(8)
Coding - Written Test Core Java
(4)
Coding - Written Test JEE
(1)

Tutorials on Java & Big Data

Tutorials - Golang
5
Tutorials - Big Data
TUT - ⏯ Starting Big Data
2
TUT - Starting Spark & Scala
10
TUT - Starting with Python
2
TUT - Pig
3
TUT - Apache Storm
3
TUT - Spark Scala on Zeppelin
14
TUT - Cloudera
4
TUT - Cloudera on Docker
21
TUT - File Formats
8
TUT - Spark on Docker
8
TUT - Flume
2
TUT - Hadoop (HDFS)
5
TUT - HBase (NoSQL)
5
TUT - Hive (SQL)
1
TUT - Hadoop & Spark
16
TUT - MapReduce
3
TUT - Spark and Scala
2
TUT - Spark & Java
14
TUT - Apache Kafka
8
TUT - Hadoop
1
TUT - PySpark on Databricks
28
TUT - Zookeeper
2
Tutorials - Enterprise Java
TUT - Starting with Java
22
TUT - ⏯ Java Video Tutorials
TUT - ⏯ Starting with Java
12
TUT - ⏯ Spring Core
1
TUT - ⏯ Spring MVC
5
TUT - ⏯ JDBC, Hibernate
6
TUT - ⏯ Spring Boot
2
TUT - ⏯ Angular with Spring
TUT - ⏯ Q&As
2
TUT - Diagnosis
2
TUT - Akka
TUT - Akka Scala
3
TUT - Akka Java
6
TUT - AWS EC2
4
TUT - CI/CD Jenkins
3
TUT - Core Java
TUT - Debugging
4
TUT - Java 8
4
TUT - JSON and Java
1
TUT - Java Beginner
1
TUT - XML and Java
8
TUT - CSV and Java
2
TUT - Docker
9
TUT - Java gRPC
3
TUT - JEE
TUT - Web & Web Services
7
TUT - REST Client
1
TUT - JSF
1
TUT - JDBC
5
TUT - FIX and Java
3
TUT - JAXB
8
TUT - JMX
1
TUT - JPA
1
TUT - MySQL
1
TUT - Scala
TUT - Scala Actors
1
TUT - Spring & Hibernate
TUT - Hibernate
2
TUT - Spring Basics
10
TUT - Spring batch
3
TUT - Hibernate & Spring
5
TUT - Spring Boot
6
TUT - Spring IO
1
TUT - Spring ORM
2
TUT - Spring other
2
TUT - Spring OXM
2
TUT - Spring Cloud
9
TUT - Tools
TUT - JMeter
3
TUT - Maven
4
TUT - Maven Assembly
2
TUT - Maven Profiles
1
TUT - Productivity Tools
9
TUT - Apache Kafka
3
TUT - Redis Tutorial
2
TUT - Kubernetes & Docker
5
TUT - Other
TUT - SQL
3
TUT - Drools
5
TUT - Apache POI
3
TUT - DOS
2
TUT - Dozer
2
TUT - ESB
1
TUT - Groovy
3
TUT - Jasper Reports
4
TUT - Logging and auditing
6
TUT - Metrics
2
TUT - Orika Mapping
2
TUT - Pentaho Kettle ETL
4
TUT - Linux
7
TUT - Webspeher MQ
3
TUT - YAML
1