Top 50 Java 8 Stream Interview Questions & Answers

Top 50 Java 8 Stream Interview Questions
Updated 2018 version!! This book contains tricky and coding Java 8 Stream interview questions that an interviewer asks. It is a compilation of advanced Java 8 Stream interview questions after attending dozens of technical interviews in top-notch companies like- AirBnb, Google, Ebay, Amazon etc.
How will this book help me? By reading this book, you do not have to spend time searching the Internet for Java 8 Stream tricky interview questions. We have already compiled the list of the most popular and the latest Java 8 Stream Interview questions.

Are there answers in this book? Yes, in this book each question is followed by an answer. So you can save time in interview preparation.

What is the best way of reading this book? You have to first do a slow reading of all the questions in this book. 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 well prepared to face a technical interview for Software Engineer position in Java 8 Stream.

What is the level of questions in this book? This book contains questions that are good for a Associate Software engineer to a Principal Software engineer. The difficulty level of question varies in the book from a Fresher to an Experienced professional.

What are the sample questions in this book?

What is a Stream in Java 8?
What are the differences between Stream and Collections in Java?
What are the different ways to create Streams in Java?
What is the difference between intermediate and terminal operation in Java Stream?
What is a non-interfering function in Java?
What is a stateless function in Java?
What are the two conditions for a Lambda function to be used in a Stream?
What are the different kinds of Streams in Java?
How will you create a Stream for using in for loop to count from 1 to 100?
What is wrong with this Stream code and how will you fix it?
What is Lazy Loading in Stream?
What is the use of anyMatch() operation in a Stream?
Why order of intermediate operations is important in Java stream?
Can we reuse a Stream in Java 8?
What is the use of collect() operation on Stream in Java 8?
How can we get the average of values of elements of a Stream in Java 8?
How can we get the summary of max, average, sum etc values of elements of a Stream in Java 8?
How can we get the comma separated list of all elements of a Stream in Java 8?
What is the use of map() operation on Stream in Java 8?
What is the use of reduce() operation on Stream in Java 8?
What are the different types of reduce() operations on Stream in Java 8?
How can we control the parallel processing of Stream in Java 8?
What is the use of empty() method in Stream?
How can we create a Stream from an Array?
How can we use Builder() to create a Stream?
How can you create a Stream of infinite numbers in Java 8?
How will you sort a Stream of String in reverse alphabetical order?
How can you create a Stream from the lines of a file in Java 8?
How will you skip some elements of a Stream in Java 8?
What is the difference between reduce() and collect() methods of Stream in Java 8?
By definition FunctionalInterface has only one method. Will the following definition of FunctionalInterface compile?
How will you get a stream of Random numbers in Java 8?
How will you get the sum of attribute like age of an object in Java 8 Stream?