Java 8 Interview Questions Preparation Course


Java 8 is one of the major releases from Java with features like Streams, Lambdas etc. A lot of companies are looking for software developers proficient in Java 8 features.

This course contains basic to expert level Java 8 interview questions that an interviewer asks. Each question is accompanied with an answer so that you can prepare for job interview in short time.

We have compiled this course after attending dozens of technical interviews in top-notch companies like- Google, Netflix, Amazon etc.

Often, these questions and concepts are used in our daily programming work. But these are most helpful when an Interviewer is trying to test your deep knowledge of Java 8 features.

Join the course for just $10!!

What is the biggest benefit of this course to me?

Finally, the biggest benefit of this course is that you will be able to demand higher salary in your next job interview.

It is good to learn Java 8 for theoretical benefits. But if you do not know how to handle interview questions on Java 8, you can not convert your Java 8 knowledge into higher salary.

What are the topics covered in this course?

We cover a wide range of topics in this course. We have questions on Java 8 best practices, Security, Pact, Bulkhead Design Pattern etc.

How will this course help me?

By attending this course, you do not have to spend time searching the Internet for Java 8 interview questions. We have already compiled the list of the most popular and the latest Java 8 Interview questions.

Are there answers in this course?

Yes, in this course each question is followed by an answer. So you can save time in interview preparation.

What is the best way of viewing this course?

You have to just watch the course from beginning to end. Once you go through all the videos, try to answer the questions in your own words. Also mark the questions that you could not answer by yourself. Then, in second pass go through only the difficult questions. After going through this course 2-3 times, you will be well prepared to face a technical interview in Java 8 topic.

What is the level of questions in this course?

This course contains questions that are good for a Fresher to an Architect level. The difficulty level of question varies in the course from a Fresher to an Experienced professional.

What are the sample questions covered in this course?

Sample questions covered in this course are as follows:

  1. What are the new features released in Java 8?
  2. What are the main benefits of new features introduced in Java 8?
  3. What is a Lambda expression in Java 8?
  4. What are the three main parts of a Lambda expression in Java?
  5. What is the data type of a Lambda expression?
  6. What is the meaning of following lambda expression?
  7. Why did Oracle release a new version of Java like Java 8?
  8. What are the advantages of a lambda expression?
  9. What is a Functional interface in Java 8?
  10. What is a Single Abstract Method (SAM) interface in Java 8?
  11. How can we define a Functional interface in Java 8?
  12. Why do we need Functional interface in Java?
  13. Is it mandatory to use @FunctionalInterface annotation to define a Functional interface in Java 8?
  14. What are the differences between Collection and Stream API in Java 8?
  15. What are the main uses of Stream API in Java 8?
  16. What are the differences between Intermediate and Terminal Operations in Java 8 Streams?
  17. What is a Spliterator in Java 8?
  18. What are the differences between Iterator and Spliterator in Java 8?
  19. What is Type Inference in Java 8?
  20. Does Java 7 support Type Inference?
  21. How does Internal Iteration work in Java 8?
  22. What are the main differences between Internal and External Iterator?
  23. What are the main advantages of Internal Iterator over External Iterator in Java 8?
  24. What are the applications in which we should use Internal Iteration?
  25. What is the main disadvantage of Internal Iteration over External Iteration?
  26. Can we provide implementation of a method in a Java Interface?
  27. What is a Default Method in an Interface?
  28. Why do we need Default method in a Java 8 Interface?
  29. What is the purpose of a Static method in an Interface in Java 8?
  30. What are the core ideas behind the Date/Time API of Java 8?
  31. What are the advantages of new Date and Time API in Java 8 over old Date API?
  32. What are the main differences between legacy Date/Time API in Java and Date/Time API of Java 8?
  33. How can we get duration between two dates or time in Java 8?
  34. What is the new method family introduced in Java 8 for processing of Arrays on multi core machines?
  35. How does Java 8 solve Diamond problem of Multiple Inheritance?
  36. What are the differences between Predicate, Supplier and Consumer in Java 8?
  37. Is it possible to have default method definition in an interface without marking it with default keyword?
  38. Can we create a class that implements two Interfaces with default methods of same name and signature?
  39. How Java 8 supports Multiple Inheritance?
  40. Can we access a static method of an interface by using reference of the interface?
  41. How can you get the name of Parameter in Java by using reflection?
  42. What is Optional in Java 8?
  43. What are the uses of Optional?
  44. Which method in Optional provides the fallback mechanism in case of null value?
  45. How can we get current time by using Date/Time API of Java 8?
  46. Is it possible to define a static method in an Interface?
  47. How can we analyze the dependencies in Java classes and packages?
  48. What are the new JVM arguments introduced by Java 8?
  49. What are the popular annotations introduced in Java 8?
  50. What is a StringJoiner in Java 8?
  51. What is the type of a Lambda expression in Java 8?
  52. What is the target type of a lambda expression ?
  53. What are the main differences between an interface with default method and an abstract class in Java 8?

What are the requirements?

  1. Some Software Development Experience
  2. Familiar with basic Java

What am I going to get from this course?

  • Learn important concepts of Java 8
  • Understand Java 8 features
  • Answer interview questions on Java 8
  • Demand higher salary or promotion based on the knowledge gained

What is the target audience?

  • Software Engineer, Sr. Software Engineer, Member Technical Staff, Expert
  • DevOps Engineer, Operations Engineer
  • Software Architect, Development Manager, Director
  • Anyone who wants to learn Java 8 features

Join the course for just $10!!

Top 100 Java Multi-threading Interview Questions

This book contains Java Multi-threading interview questions that an interviewer asks. Concurrency is an advanced topic for Java technical interview. This book is a compilation of Java Concurrency interview questions after attending dozens of technical interviews in top-notch companies like- Facebook, Google, Ebay, Amazon etc.

Each question is accompanied with an answer because you want to save your time while preparing for an interview.

The difficulty rating on these Questions varies from a Junior level programmer to Architect level.

Once you go through them in the first pass, mark the questions that you could not answer by yourself. Then, in second pass go through only the difficult questions.

After going through this book 2-3 times, you will be very well prepared to face a technical interview on Java Multi-threading for an experienced programmer.

Buy Top 100 Java Multi-threading Interview Questions book on Amazon.com

Sample Questions:

  • What are the three different priorities that can be set on a Thread in Java?
  • What are the differences between Pre-emptive Scheduling Scheduler and Time Slicing Scheduler?
  • What is the purpose of join() method in Thread class?
  • What is the fundamental difference between wait() and sleep() methods?
  • Is it possible to call run() method instead of start() on a thread in Java?
  • What is a daemon thread in Java?
  • How can we make a regular thread Daemon thread in Java?
  • How will you make a user thread into daemon thread if it has already started?
  • Can we start a thread two times in Java?
  • What is a Shutdown hook in Java?
  • In what scenarios can we interrupt a thread?
  • What is synchronization in Java?
  • What is the purpose of Synchronized block in Java?
  • What is static synchronization?
  • In Java, is it possible to lock an object for exclusive use by a thread?
  • How notify() method is different from notifyAll() method?
  • What is a Deadlock situation?
  • What is the meaning of concurrency?
  • What is the main difference between process and thread?
  • What is a process and thread in the context of Java?
  • What is a Scheduler?
  • What is the minimum number of Threads in a Java program?
  • What are the properties of a Java thread?
  • What are the different states of a Thread in Java?
  • How will you set the priority of a thread in Java?
  • What is the purpose of Thread Groups in Java?
  • Why we should not stop a thread by calling its stop() method?
  • How will you create a Thread in Java?
  • How can we stop a thread in the middle of execution in Java?
  • How do you access the current thread in a Java program?
  • What is Busy waiting in Multi-threading?
  • How can we prevent busy waiting in Java?
  • Can we use Thread.sleep() method for real-time processing in Java?
  • Can we wake up a thread that has been put to sleep by using Thread.sleep() method?
  • What are the two ways to check if a Thread has been interrupted?

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Top 1000 Java Interview Questions


This is the ultimate book for interview preparation for Java jobs. It has questions on Java, Collections, Multi-threading, Spring, Hibernate, JSP, Design patterns, GIT, Maven, AWS and Cloud computing.

It is a digest of questions from multiple sources. It covers almost all the technical areas of an interview for Java engineer position.

The difficulty level of questions in this book vary from beginner to expert level.

Once you go through this book, you will be very well prepared for facing Java interview for an experienced Java Software Engineer.

This books also contains Java tricky Interview questions, Java 8, Microserivces and AWS questions.

Technical job applicants can save precious time in interview preparation by reading this book. You don’t want to waste time in searching for Java questions and answers online.

This book is your main interview preparation book for Java based jobs.

Top 50 Hibernate Interview Questions

Top 50 Hibernate Interview Questions Book
Top 50 Hibernate Interview Questions Book

Top 50 Hibernate Interview Questions book contains basic to architect level Hibernate interview questions that an interviewer asks. Each question is accompanied with an answer so that you can prepare for job interview in short time.

We have compiled this list of Hibernate questions after attending dozens of technical interviews in top-notch companies like- Google, Facebook, Ebay, Amazon etc.

Often, these Hibernate questions and concepts are used in our daily programming work. But these are most helpful when an Interviewer is trying to test your deep knowledge of Hibernate.

Sample Questions:

What is the difference between a Set and a Bag in Hibernate?
How can we monitor the performance of Hibernate in an application?
How can we check if an Object is in Persistent, Detached or Transient state in Hibernate?
What are the different ORM levels in Hibernate?
What are the different ways to configure a Hibernate application?
What is Query Cache in Hibernate?
How will you order the results returned by a Criteria in Hibernate?
How does Example criterion work in Hibernate?
How does Transaction management work in Hibernate?
How can we mark an entity/collection as immutable in Hibernate?
What are the different options to retrieve an object from database in Hibernate?
How can we auto-generate primary key in Hibernate?
What is an Object Relational Mapping (ORM)?
What is the purpose of Configuration Interface in Hibernate?
What is Object Relational Impedance Mismatch?
What are the main problems of Object Relational Impedance Mismatch?
What are the key characteristics of Hibernate?
Can you tell us about the core interfaces of Hibernate framework?
How will you map the columns of a DB table to the properties of a Java class in Hibernate?
Does Hibernate make it mandatory for a mapping file to have .hbm.xml extension?
What are the steps for creating a SessionFactory in Hibernate?
Why do we use POJO in Hibernate?
What is Hibernate Query Language (HQL)?
How will you call a stored procedure in Hibernate?
What is Criteria API in Hibernate?
Why do we use HibernateTemplate?
How can you see SQL code generated by Hibernate on console?
What are the different types of collections supported by Hibernate?
What is the difference between session.save() and session.saveOrUpdate() methods in Hibernate?
What are the advantages of Hibernate framework over JDBC?
How can we get statistics of a SessionFactory in Hibernate?
What is the Transient state of an object in Hibernate?
What is the Detached state of an object in Hibernate?
What is the use of Dirty Checking in Hibernate?
What is the purpose of Callback interface in Hibernate?
What are the different types of Association mappings supported by Hibernate?
What are the different types of Unidirectional Association mappings in Hibernate?
What is Unit of Work design pattern?

Microservices Interview Questions

Microservices Interview Questions Book
Microservices Interview Questions Book

Microservices is the latest trend in Technology world. It is the new architecture on which very few books have been written.
If you are aiming to get a job in companies with Microservices architecture like- Netflix, Amazon etc. then this book can help you prepare for the technical interview.
This books also covers Architect level information in Q&A format for easy grasp of the concept.
This book helps you in understanding the deep concepts behind Microservices in a Q&A format.

Get the answers to questions like:

What are the characteristics of a Good Microservice?
Is it a good idea for Microservices to share a common database?
What are the issues in using REST over HTTP for Microservices?
What is Reactive Extensions?
What is Semantic Versioning?
What is Continuous Integration?
What is Ubiquitous language?
What is Mike Cohn’s Test Pyramid?
How can we eradicate non-determinism in tests?
What is PACT?
What is a Consumer Driven Contract (CDC)?
What is Canary Releasing?
How can we separate Deployment from Release of Microservices?
How will you implement Service Discovery in Microservices architecture?
What is the difference between Orchestration and Choreography in Microservices architecture?

Top 200 Java Technical Interview Questions

Top 200 Java Technical Interview Questions Book
Top 200 Java Technical Interview Questions Book

Top 200 Java Technical Interview Questions book contains the Top 200 Java Technical interview questions that you can expect in a Java interview. Each question is accompanied with an answer because you want to save precious time to prepare for a job interview.

We have compiled this list of these questions based on the experience of dozens of technical interviews in top technology companies like- Google, Facebook, Oracle, Amazon etc.

Sample questions are:

Why constructors cannot be final, static, or abstract in Java?
Can we inherit a Constructor?
If there are no pointers in Java, then why do we get NullPointerException?
What is meant by covariant return type in Java?
Is it possible to achieve Runtime Polymorphism by data members in Java?
Does Java allow us to use private and protected modifiers for variables in interfaces?
Why a String object is considered immutable in java?
How will you create an immutable class in Java?
What is the difference between Serializable and Externalizable interface?
In Java, if we do not specify any value for local variables, then what will be the default value of the local variables?
What is the difference between JDK and JRE?
What is Java Virtual Machine (JVM)?
What are the different types of memory areas allocated by JVM?
What is JIT compiler?
How Java platform is different from other platforms?
Why people say that Java is ‘write once and run anywhere’ language?
How Multi-threading works in Java?
What are the advantages of Multithreading?
What are the disadvantages of Multithreading?
What is a Thread in Java?
What is a Thread’s priority and how it is used in scheduling?
What are the differences between Pre-emptive Scheduling Scheduler and Time Slicing Scheduler?
What is the purpose of join() method in Thread class?
What is the fundamental difference between wait() and sleep() methods?
Is it possible to call run() method instead of start() on a thread in Java?
What is a daemon thread in Java?
How can we make a regular thread Daemon thread in Java?
How will you make a user thread into daemon thread if it has already started?
Can we start a thread two times in Java?
What is a Shutdown hook in Java?
In what scenarios can we interrupt a thread?
What is synchronization in Java?
What is the purpose of Synchronized block in Java?
What is static synchronization?
In Java, is it possible to lock an object for exclusive use by a thread?
How notify() method is different from notifyAll() method?
What is a Deadlock situation?
How does ClassLoader work in Java?
Do you think ‘main’ used for main method is a keyword in Java?
Can we write main method as public void static instead of public static void?
What is Runtime Polymorphism?
Let say, we run a java class without passing any arguments. What will be the value of String array of arguments in Main method?
What is the difference between byte and char data types in Java?
What are the main principles of Object Oriented Programming?
What is the difference between Object Oriented Programming language and Object Based Programming language?
In Java what is the default value of an object reference defined as an instance variable in an Object?
Why do we need constructor in Java?
Why do we need default constructor in Java classes?
What is the value returned by Constructor in Java?
What is the purpose of ‘this’ keyword in java?
Explain the concept of Inheritance?

Top 100 Tricky Java Interview Questions

Top 100 Tricky Java Interview Questions Book
Top 100 Tricky Java Interview Questions Book

Top 100 Tricky Java Interview Questions book contains tricky and nasty Java interview questions that an interviewer asks in Java technology interview. It is a compilation of questions after attending dozens of Java interviews in top-notch companies like- Google, Facebook, Ebay, Amazon etc. You can save time by reading questions as well as answers from the book.

Read Top 100 Tricky Java Interview Questions book on Amazon.com

Sample questions are:

  • How can you determine if JVM is 32-bit or 64-bit from Java Program?
  • What is the right data type to represent Money (like Dollar/Pound) in Java?
  • Is ++ operation thread-safe in Java?
  • How can you mark an array volatile in Java?
  • Can you create an Immutable object that contains a mutable object?
  • In Java, can we store a double value in a long variable without explicit casting?
  • What will this return 5*0.1 == 0.5? true or false?
  • How can you do constructor chaining in Java?
  • How can we find the memory usage of JVM from Java code?
  • Explain the difference between fail-fast and fail-safe iterators?
  • Can you catch an exception thrown by another thread in Java?
  • Do you think Java Enums are more powerful than integer constants?
  • How can you check if a String is a number by using regular expression?

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