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03: Java Functional interfaces and Lambda expressions Q&As

The functional interfaces and Lambda expressions are going to make your code concise when coding with Java 8. These are the most awaited features among Java developers. If you understand the following examples, you will know what a lambda expression is & … Read more ›...

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03: Java GC tuning for low latency applications

This assumes that you have read the basics on Java GC at Java Garbage Collection interview Q&A to ascertain your depth of Java knowledge. This is a must know topic for those who like to work on low latency applications. Q1. In what ways does GC impact latency and throughput...

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03: JAX-RS how to create a RESTFul Web Service in Java?

Q. What are the high level steps in developing a RESTful web service in Java?
A. You can see the complete tutorial in the tutorials section. This post is to quickly explain the major steps at the job interview. Knowing all the basics is of no use if you can’t write a web service.

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03: Kubernetes (i.e. Minikube) – deploy a spring boot microservice app

minikube-springboot app

This extends Kubernetes (i.e. Minikube) – deploy a node js service.

Docker containers & Kubernetes for deploying Spring Boot microservices. As mentioned earlier in Kubernetes, Docker & Microservices interview Questions & Answers.

Docker gives you application isolation, and solves the dependency hell issues.

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03: Q16 – Q17 Java Polymorphism vs Overriding vs Overloading

Polymorphism is the ability of a class instance to behave as if it were an instance of another class in its inheritance tree, most often one of its ancestor classes. Overriding is the means by which you achieve polymorphism. Java Polymorphism vs Overriding vs Overloading explained in detail to handle drill down Java OOP interview questions with ease when quizzed further.

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03: Tree traversal algorithms in Java

Q1. What are the different binary tree traversal mechanisms? A1. Traversing a tree means visiting all the nodes of a tree in order. Many different binary tree algorithms involve traversals. For example, if you wish to count the number of employees in an organizational chart you must visit each node....

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03: Understanding Big O notations with Java

Q1.  Have  you seen job advertisements requiring Java candidates to work in real-time or high volume transaction processing systems? A1.  If you are applying for such jobs, you can be quizzed on Big O notation. Here are some basics to brush up on. … Read more ›...

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04: 5 Java generics Interview Q&As on wildcards with examples

Q1. If java.lang.Object is the super type for java.lang.Number and, Number is the super type for java.lang.Integer, am I correct in saying that List<Object> is the super type for List<number> and, … Read more ›...

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04: 5 JAXB interview Questions & Answers

JAXB interview Questions & Answers Links: 6 Java RESTful Web services Interview | 11 SOAP Web service interview | Java Web Services interview Questions & Answers Q1. What does JAXB stand for? What is an XML Binding? A1. … Read more ›...

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04: 6 popular Java multithreading interview Q&As for the experienced

Q1. Why do threads need to communicate with each other? A1. Inter thread communication is very similar to inter process communication where 2 or more processes communicate with other, the only difference being that inter thread communication happens within the same process (i.e. within the same memory model). … Read...

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04: 7 Java Collection Quizzes

Q1. When is an object needs to implement the Comparable interface? a) When adding it to a HashSet. b) When adding it to a TreeSet. c) When adding it to a LinkedHashSet. … Read more ›...

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04: 7 JSP interview questions and answers

JSF or JavaScript based frameworks like angularjs, ember, etc are more popular than JSPs for web developemnt. Q1. What is a JSP? How does it differ from a Servlet? A1. JSP stands for Java Server Pages. JSP technology extends the Servlet technology, which means anything you can do with a...

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04: Convert Lists to Maps and Maps to Lists with Java 8 power

Why convert from a list to a map? Maps allow you to store and access data by a “KEY”. Lists only allow you to access data by either index or by looping through the whole list to find a value that you are interested in. … Read more ›...

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1 2 3 4 5 6 7 … 15

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

50+ Free Java & Big Data Interview Q&As