Top 50 Java 8 Latest Interview Questions


This book contains the latest Java 8 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 Java 8 questions based on the experience of dozens of technical interviews in top technology companies like- Google, Facebook, Oracle, Amazon etc.

Often, these Java 8 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.

The difficulty rating on these Questions varies from a Fresher level software programmer to an Architect.

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 8 for an experienced programmer.

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Sample questions are:

  • How does Internal Iteration work in Java 8?
  • Can we provide implementation of a method in a Java Interface?
  • What are the main differences between an interface with default method and an abstract class in Java 8?
  • Is it mandatory to use @FunctionalInterface annotation to define a Functional interface in Java 8?
  • How can we get duration between two dates or time in Java 8?
  • What is the new method family introduced in Java 8 for processing of Arrays on multi core machines?
  • What are the differences between Collection and Stream API in Java 8?
  • What are the new features released in Java 8?
  • What are the main benefits of new features introduced in Java 8?
  • What is a Lambda expression in Java 8?
  • What are the three main parts of a Lambda expression in Java?
  • What is the data type of a Lambda expression?
  • Why did Oracle release a new version of Java like Java 8?
  • What are the advantages of a lambda expression?
  • What is a Functional interface in Java 8?
  • What is a Single Abstract Method (SAM) interface in Java 8?
  • How can we define a Functional interface in Java 8?
  • Why do we need Functional interface in Java?
  • What are the main uses of Stream API in Java 8?
  • What are the differences between Intermediate and Terminal Operations in Java 8 Streams?
  • What are the differences between Iterator and Spliterator in Java 8?
  • How can we get current time by using Date/Time API of Java 8?
  • What is Type Inference in Java 8?
  • Does Java 7 support Type Inference?
  • What are the main differences between Internal and External Iterator?
  • What are the main advantages of Internal Iterator over External Iterator in Java 8?
  • What are the applications in which we should use Internal Iteration?
  • What is the main disadvantage of Internal Iteration over External Iteration?
  • Can we provide implementation of a method in a Java Interface?
  • Which method in Optional provides the fallback mechanism in case of null value?
  • What is a Default Method in an Interface?
  • What is a Spliterator in Java 8?
  • Why do we need Default method in a Java 8 Interface?
  • What is the purpose of a Static method in an Interface in Java 8?

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