Java Developer Interview Questions

joseph cole

Updated on March 2, 2023

Java Developer Position Overview

Basic client/server applications are moving to a service-oriented architecture and enterprises are striving to step up to cloud architecture and mobile applications. In this ever-evolving digital landscape, Java is persistently seen as a major force that enables these advanced technologies.

With the Java taking the hot seat in the coding world, the demand for a proficient Java Developer is also now more than ever. From redesigning the user experience on the website to building mobile apps or ensuring that the business-critical applications and software stays cutting-edge, Java Developers are the ones we turn to. So, when it comes to building a world-class team of developers recognizing and recruiting quality talents becomes paramount.

Qualification to look for:

  • Bachelor’s degree in Computer Science, Information System or any other closely related field
  • A professional certification in Java

Skills to look for:

  • Relational databases
  • SQL and ORMJ2EE framework
  • Java-based web services
  • Object-oriented analysis and design
  • XML, Xquery, XSL
  • JSP EJB (Enterprise Java Beans)
  • Test-driven development

A resume by itself doesn’t exactly represent the actual skills of a candidate. Assess the candidates with accuracy using this comprehensive list of Java Developer interview questions.

Computer Science questions

  • What are the characteristics of an acid database system?
  • How will you detect a loop in a linked list?
  • What is the difference between thread and process?

Job-specific questions

  • What are the transient variables?
  • How are arguments passed in Java?
  • What do you know about encapsulation and polymorphism?
  • How will you differentiate runtime exceptions from checked exceptions?
  • What are lambda expressions and why is it considered to be a big thing in Java 8?
  • Differentiate ConcurrentHashMap from HashMap.
  • What is the function of an object factory?
  • How will you implement the Singleton pattern?
  • What is the difference between static and dynamic language?
  • Is Java statically or dynamically typed?
  • What is garbage collection in Java?

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