Java Interview Guide : 200+ Interview Questions and Answers

Get Ready for your Java Interview with 200+ Java Interview Questions for Beginners

  • in28Minutes Official
  • 4.58
  • (6245 reviews)
  • 6 hrs
  • 55 lectures
  • Udemy
Java Interview Guide : 200+ Interview Questions and Answers

What you will learn?

  • You will understand what kind of questions are asked in Beginner Java Interviews
  • You will be able to Answer questions on Java Platform, Wrapper Classes and Strings
  • You will be able to quickly revise all Your Java Concepts with Awesome Examples
  • You will Understand New Features in Java 5, Java 6, Java 7 and Java 8
  • You will Understand Basic and Advanced Object Oriented Concepts
  • You will be able to Answer Questions on Collections, Generics and MultiThreading
  • You will Understand Exception Handling Best Practices
  • You will Understand basics of Functional Programming - Lambda Expressions and Streams

Your trainer

in28Minutes Official

Ranga is an AWS Certified Solutions Architect Associate.

We are teaching 30+ Courses to 450K Learners on DevOps, Cloud ( AWS, PCF, GCP, and Azure ), Full Stack ( React, Angular ), Java Programming, and Java Frameworks ( Spring, Spring Boot, Spring MVC, Hibernate ).

We use Problem-Solution based Step-By-Step Hands-on Approach With Practical, Real-World Application Examples.

We have a wide range of courses focused on Spring Boot - Creating APIs and Microservices, Deploying to Cloud ( AWS, Azure, Docker, Kubernetes, Azure ), and Integrating with Full Stack Front end frameworks ( React & Angular ).

55 lessons

Easy to follow lectures and videos covering subject details.

6 hours

This course includes hours of video material. Watch on-demand, anytime, anywhere.

Certificate of Completion

You will earn a Certificate of Completion at the end of this course.

Course curriculum

Introduction to Course05:58

  • Introduction01:32
  • Three Things You need to Know01:14
  • Congratulations00:41
  • Course Overview02:31

  • Java Popularity and Platform Independence05:07
  • Compare JDK vs JVM vs JRE04:05
  • Differences between C++ and Java02:07
  • Java Classloaders02:42

  • Wrapper Classes11:01

  • String, StringBuffer and StringBuilder09:46

  • Object Basics - Class, Object, State and Behavior06:35
  • toString method03:27
  • equals and hashCode methods10:33
  • Inheritance, Method overloading and Method overriding11:21
  • Interface08:26
  • Abstract Class09:59
  • Constructors - this() and super()07:25
  • Do not forget to do Exercises01:43

  • Polymorphism and instanceof08:34
  • What is Coupling?05:23
  • What is Cohesion?05:00
  • What is Encapsulation?04:39
  • Inner Class and Static Inner Class05:47
  • What is an anonymous class?02:50

  • Access Modifiers - public, private, protected and default09:55
  • Final method, variable and class03:42
  • Static variables and methods07:01

  • Simple Puzzles on conditions and loops08:09

  • Exception Handling - try, catch and finally09:10
  • Checked and Unchecked Exceptions05:48
  • Throwing an Exception05:43
  • Creating Custom Exceptions11:19

  • Arrays05:38
  • Enum05:08
  • Variable Arguments03:49
  • Asserts and Garbage Collection05:24
  • Static and Member Initializers04:19
  • Serialization06:58

  • Collection Interface Hierarchy05:40
  • Collection & List Interface methods and classes - ArrayList, Vector & LinkedList07:32
  • Set interfaces and implementations - HashSet, LinkedHashSet and TreeSet06:00
  • Map interfaces and implementations - HashMap, LinkedHashMap and TreeMap04:14
  • Queue interfaces and implementations - Deque and BlockingQueue06:36
  • Collection Code Examples13:18

  • Concurrent Collections - CopyOnWriteArrayList07:01
  • CompareAndSwap, Locks and AtomicOperations10:41

  • Generics05:23

  • MultiThreading - Need for Threads and Creating Threads08:20
  • Thread states, priority, ExecutorService and Callable07:03
  • Synchronization of Threads. join, wait, notify and notifyAll methods09:17

  • Functional Programming Examples - Streams and Lambda Expressions08:34
  • Functional Programming Questions and Answers18:57

  • Java New Features - Java 5, 6, 7 and 807:48

  • Bonus Lecture00:18
  • Conclusion01:34
Enroll now
Online Courses

Learning Java doesn't have to be hard. Here is our curated list of recommended online courses that will guide you step-by-step in the learning process.

Learn more
Books

Are you an avid book reader? Do you prefer paperback, or maybe Kindle version? Take a look at our curated list of Java related books and take yourskills to the next level.

Learn more
YouTube videos

The number of high-quality and free Java video tutorials is growing fast. Check this curated list of recommended videos - there is no excuse to stop learning.

Learn more