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Top Java 8 Interview Questions to Crack the Coding Interview

by Interview Kickstart Team in Interview Questions
December 9, 2021

Top Java 8 Interview Questions to Crack the Coding Interview

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Preparing for Java 8 interview questions can get quite tricky. Professional help and guidance can amp up your chances of cracking it in tier-1 tech companies like Google, Netflix, Amazon, and the likes. 

Java 8 is the latest release for Java that consists of new features, enhancements, and bug fixes. This facilitates improved efficiency in developing and running Java programs. It includes upgrading the Java programming model and a coordinated evolution of the JVM, Java language, and libraries. Due to its ease of usability, minimal resource usage, and flexibility, it has acquired widespread popularity. As a result, Java 8 is a common component in technical interview questions of all top-tier tech organizations.

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If you want to work as a Java developer, Java tester, or Java automation tester, you must have advanced Java skills and a thorough understanding of Java 8 interview questions. Let’s take a look at what we’ll cover in this article:

  • New Features Added in Java 8
  • Advantages of Using Java 8
  • Which Type of Programming Does Java 8 Belong To?
  • Java 8 Interview Questions for Freshers
  • Java 8 Interview Questions for Advanced Levels
  • Java 8 Interview Questions for Experienced Software Engineers
  • FAQs on Java 8 Interview Questions

Which New Features Are Added in Java 8?

Java 8 comes with a host of new features. Some of them are:

  • Method References: With this feature, you will be able to define Lambda Expressions by addressing methods that directly use their names.
  • Lambda Expressions: This feature will allow you to treat actions as objects.
  • Optional: This special wrapper class can be used to express optionality.
  • Default Methods: With this, you can add full implementations in interfaces apart from abstract methods.
  • Functional Interface: This new addition is an interface with a maximum of one abstract method. Here, you can provide implementation by using a Lambda Expression.
  • Nashorn, JavaScript Engine: This is a Java-based engine for evaluating and executing JavaScript code.
  • Date API: Another new feature of Java 8 is an improved, JodaTime-inspired, immutable Date API.
  • Stream API: This new addition is a special iterator class that lets you process collections of objects functionally and systematically.

In addition to these, Java 8 brings along a lot of under-the-hood feature enhancements at both the JVM and compiler levels.

What Are the Advantages of Using Java 8?

The advantages of using Java 8 are listed below:

  • The Java 8 code is more readable and concise.
  • The code in Java 8 is reusable.
  • It is easier to test and maintain the code in Java 8.
  • In Java 8, the code is highly concurrent yet scalable.
  • Users can perform parallel executions and operations in Java 8.
  • The code in Java 8 can be ported across multiple operating systems.
  • Here, users can easily write database-like operations.
  • With enhanced stability, applications perform better in Java 8.
  • Adequate support from Java 8 makes the code way more productive.

Which Type of Programming Does Java 8 Belong To?

JDK 8 is one of the most significant releases of the programming development platform. Due to its lambda expressions’ upgrade, Java 8 falls under a functional programming language. But, the other add on features also put Java 8 in these categories:

  • Functional programming language
  • Object-oriented programming language
  • Logic programming language
  • Procedural programming language

Looking to learn a new programming language? Read What Programming Languages Should I Learn? to understand which programming language is best for you.

Java 8 Interview Questions for Freshers

Many individuals aspire to start their programming careers with Java 8. Some of the standard Java 8 interview questions for freshers are given below:

  1. Describe some of the newly added features in Java 8.
  2. Mention the unique advantages of Java 8.
  3. What are functional or SAM interfaces?
  4. What are static methods in Interfaces?
  5. What is the default method, and why is it necessary?
  6. Name the categories of predefined function interfaces.

To brush up on your Java fundamentals, visit the Learn folder and check out our comprehensive articles on Java.

Java 8 Interview Questions for Experienced Software Engineers

Common Java 8 interview questions for professionals with a minimum of 5 years of experience are given below:

  1. How many types of memory areas does JVM allocate?
  2. What is the JIT compiler?
  3. Is Empty .java file name a valid source file name?
  4. What is an object-oriented paradigm?
  5. Can we override static methods?
  6. What will be the output of the following Java program?

class Test  

{  

int i;  

}  

public class Main  

{  

   public static void main (String args[])  

   {  

       Test test = new Test();  

       System.out.println(test.i);  

   }  

}  

  1. Why is Inheritance used in Java?
  2. Why is method overloading not possible by changing the return type in Java?
  3. Mention the differences between Overloading and Overriding.
  4. Is it possible to declare a constructor as final?
  5. What do you mean by reflection, and why is it useful?
  6. Can you use == on enum?
  7. In Java, is there anything like the static class?
  8. What do the …. dots in the method parameters mean?
  9. What is a JavaBean? 

Brushing up your conceptual and technical skills and preparing these Java 8 interview questions will certainly enhance your technical interview preparation.

Java 8 Interview Questions for Advanced Levels

Some tough Java 8 interview questions for professionals with more than 10 years of experience are:

  1. What is the basic structure/syntax of a lambda expression?
  2. What is a type interface?
  3. What is Method Reference in Java8?
  4. What does the String::ValueOf Expression mean?
  5. What are Java 8 strings?
  6. What are the sources of data objects a Stream can process?
  7. What are Intermediate and Terminal Options?
  8. Define a static initializer?
  9. What is the JIT?
  10. Does Java support default parameter values?
  11. What is Double Brace Initialization in Java?
  12. Why is char[] more preferable than String for passwords?

Need more practice questions? Read Top Java Interview Questions for a comprehensive list of Java interview questions asked at FAANG and other tier-1 tech companies.

FAQs on Java 8 Interview Questions

Q1. What are the features of Java 8?

Java 8 offers these features for Java programming: Lambda Expression and Virtual Extension Methods, Date and Time API, Nashorn JavaScript Engine, and Enhanced Security.

Q2. What is the average salary of front-end software engineers?

The average salary of a front-end developer ranges from $116,737 to $119,224.

Q3. What can you do with Java 8?

Java 8 is one of the latest releases of the Java programming language. It comes with enormous features such as date and time APIs, Java stream API, functional interfaces, a new JavaScript engine, Nashorn, and many more. 

Q4. How to prepare for Java 8 interview questions for 10 years of experienced developers?

Firstly, to prepare for Java 8 interview questions for coding or tech interviews, be thorough with Java 8 features and their fundamentals. Study the most significant Java 8 features such as Lambda Expressions, Method References, Optional, Functional Interface, Default methods, Nashorn, JavaScript Engine, Stream API, and Date API.

Q5. What is lambda in Java 8?

A Lambda expression in Java 8 is a helpful feature that allows you to represent one method interface using an expression clearly and concisely. It accepts parameters and outputs a value. It aids in iterating, filtering, and extracting data from a collection.

Get Ready for Your Next Java 8 Interview

We hope that this article on Java 8 interview questions has given you an insight into cracking these questions with ease. 

Are you looking for more guidance? Register for IK’s webinar today to learn how to leverage our best-in-class interview preparation courses and mock interviews with experts.

Interview Kickstart has helped over 9,000 engineers land coveted offers from FAANG and tier-1 companies. Our instructors are technical leads and hiring managers at FAANG and know exactly what it takes to crack big tech interviews.

Want to learn more? Sign up for our FREE webinar on How to Nail Your Next Tech Interview.


WEBINAR +LIVE Q&A

How To Nail Your Next Tech Interview

Hosted By
Ryan Valles
Founder, Interview Kickstart
Our tried & tested strategy for cracking interviews
How FAANG hiring process works
The 4 areas you must prepare for
How you can accelerate your learnings

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