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Java Write For Us – Interview questions for a Java developer differ from those for a programmer specializing in another language.

Once you have sent your CV for the vacancy you want and already had the first interviews, the final stage arrives at the technical interview.

Starting because each programming language has its syntax; in addition, problem-solving can done in many ways, and it is the recruiter’s job to analyze the candidate’s way of working.

Here we show you the most frequent questions a Java developer is asked, their possible answers and some tips so that you arrive full of confidence in your next recruitment stage.

What is object-oriented programming?

Object Oriented Programming (OOP) is a programming model that works with the concepts of classes and objects. This model used to structure software programs into simple, reusable parts or classes so that individual instances of objects created.

This paradigm stops proposing a logic for the programs and focuses on the creation of objects.

What is an object?

It defined as an instance of a class. The object can have a state and behaviour. It created with “new()”.

What is a class?

Within a class, the data and the code that acts on it are defined; therefore, when describing the nature of an object, the types with the base on which are built and describe the elements to create the entire program.

What are the four pillars of object-oriented programming?

  • Polymorphism
  • Abstraction
  • Inheritance
  • encapsulation

What is inheritance?

Heritage indicates that one class can extended to another so the code can reused in the next class. The class that extends your code known as a superclass; the class that inherits the code for reuse called a subclass.

What is abstraction?

Abstraction occurs when the essential data of an object selected to displayed and hides other elements less relevant to the use that being given to the thing.

What is polymorphism?

Polymorphism the skill of an object to have a different shape depending on how it is invoked within code.

What is encapsulation?

It is to maintain the security of the code, protecting the objects and hiding their attributes. It is common to encapsulate classes, and that information can only be accessed by operations defined during their encapsulation. 

Why is Java portable and standalone?

It is portable because the code can be read on any device or machine, and at the same time, it is independent because it does not need a specific operating system or modifications to be executed. It has its build platform. 

How many types of variables are there in Java?

  • Variables locales

They the variables defined within a block, method or constructor.

  • instance variables

 Moreover,they non-static variables declared outside of any block, method, or constructor.

  • static variables

They also known as class variables and declared using “static”. However, you can only have one copy of these per class.

What are the differences between vectors and matrices?

Arrays are static, so they have defined and fixed sizes and types. On the other hand, vectors dynamically assigned and contain dynamic lists of references to other objects.

These can fundamental theory questions in the application of the Java language, but other questions could asked to understand your way of working, such as the following:


  • From what approach would you solve a particular problem?
  • Why would you do it this way?
  • What would your reaction be if someone criticizes your way of working at a certain moment?
  • How would you solve an error in code? Here they might give you some options.
  • How would you resolve a situation in which your way of working was correct and your colleagues propose another?


These are just some of the questions IT recruiters can ask Java developers, but once you’ve got your technical knowledge down, it’s all about working on how you collaborate with others. 

Are you observing for a new job as a Java developer? In our employment platform you can find thousands of vacancies in Mexico, the US and remotely.

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