Top 7 Java developer Interview Questions and Answers
What started just as a programming language which was used for television programming, later became the language of the internet. It is one of the most essential skills a computer engineer must have to make a career in the age of digital transformation. The future of Java is estimated to have outgrown itself because of its implementation in various places.
Java as a language is touted to grow further, thanks to its enterprise-grade capabilities, and as per job platforms such as Glassdoor and Indeed.com, the demand has only surged ahead, despite R and Python becoming recent hot favourites in the developer community. Furthermore, with initiatives like the Digital India scheme, it will be interesting to see how the Indian IT services sector (currently at $150 billion) moves ahead. This is also one of the primary reasons that java programming certification courses are gaining traction both online as well as in offline programmes.
Java web development course is opted by numerous aspirants all over the world because it is the most used programming language for developing web applications and platforms. According to the Java platform, there are more than 3 million mobile devices that actively run Java. In recent years it has been proved to be more friendly in terms of the user interface. The popularity,maturity and feasibility in accessing.
Top reasons that will help justify that one should invest in a java developer course.
One of the top implemented programming languages and with a program so flexible yet complex can help create applications and web portals.
It would be beneficial to learn a coding language for Java, it will help to create perspective and increase imagination as a programmer.
Java is an object-oriented language, which would only make some logic after achieving a level of mastery. This helps to create thinking in both spaces logically and abstractly.
It has been in the industry of programming languages for more than 22 years and it still hasn’t lost its charm. The years that have been put into the program by the people have created many possibilities and have helped answer all the mysteries related to Java.
There are loads of resources already made available for the programming language, this helps in drawing conclusions with better expertise and supervision.
It has been on top of the top-paying job profiles, a software and computer engineer could choose from.
Java has a lot of full-time practitioners all around the world, it’s a skill that has the scope to provide well compensation for the years to come.
Applications of Java
Website and webpage related applications
Big data technologies
Business applications and much more
Apart from the aforementioned applications, Java can be used for achieving multiple objectives. Your only limitation when it comes to programming with Java is your own imagination.
Skills required to dominate the field of software
Certain skills are expected from a java developer which are to be fulfilled as a part of the job description. Depending on the role and seniority level of the job, one could handle a single code and one could be responsible for handling a total team that will focus on the core development of the team.
There are some prerequisites that a java developer should possess to increase their chances of getting hired at a reputed tech company i.e. working as a team and building skills such as leadership and organization.
It is essential to have patience and perseverance to overcome long hours required for coding and debugging, it is a process that requires continuous efforts.
Be open to adapt and overcome the current limitations, you need to be always updated with the latest trends in technology and keep learning.
Increase of expertise, it is essential to have a good command over a variety of designs, languages and methodologies. For example SQL, ORM, RabbitMQ, Microservices, Agile, and Scrum.
A developer should be comfortable using multiple frameworks, that boost productivity and help in creating a better work portfolio.
Ability to acquire accurate requirements for the processes and work closely to understand the underlying problem and improve the scope of development.
A developer has to write long codes and it is bound to have some mistakes in them. A good developer should have an eye for detail and rectify errors in a testing model environment.
Keep brushing your skills and inculcate the habit of self-learning the programming language. It requires an essential creative thinking mindset to get out of cheeky situations.
Java developer Interview Questions
The potential list of basic interview questions for Java developers that are most likely to be asked in an interview.
1. Which is the most opted and secure way of storing sensitive data?
Char and String array both are used as a method of storing sensitive data; it depends on the application. String constant pool for re-usability in a string. This ensures the safety of memory for a long duration. Since the String is immutable there is no valid method to override the existing status of the string; as for Char, it can be changed via creating an override with the help of a clear password.
2. How can you detect an exception thrown by another thread?
The correct approach to this situation is by running a proper runtime exception function. And this eliminates the need to pass the exception from one thread to another. It just requires a proper identification of the thread, without the need for an additional background thread.
3. What languages do you know and how can you decide which is more useful?
This answer is relative to each student or applicant. Everyone has their strengths and weaknesses. It all boils down to how you as a developer would present your defects and skills to the recruiter. The main essential aspect that needs to be kept in mind is the mindset and efficiency in communication. The best way to counter this question is by communicating better and creating a bond with the recruiter
4. In which position would you like to see yourself after 5 years?
This question is asked in every field be it public or corporate sector. It is also selective and depends on the applicant. It is not wrong to have dreams but to impress the recruiter you must create a paradigm in your dream that will align with the company’s interest in the future as well.
5. How much experience do you have in coding?
The term of experience does not matter as long as you are skilled at your role as a developer. The experience would get you to places that can’t be reached easily, but skills can be a bridge and help more than experience.
6. Have you had any important role in creating any software?
The psychology behind this question is to test the leadership abilities and team-building qualities that would help boost your portfolio. These qualities as mentioned earlier above would genuinely help to create an impact and will keep you ahead in the competition. Take initiatives in college or company projects and learn from those experiences.
7. What are the wrapper classes in java as a programmer?
The wrapper classes are used to convert the java primitives into a reference type. Here, the data types are wrapped into the type object of that class. This question has a simple response but with much on the technical side it is left unanswered by the students at most of the times. Stick to the basics and keep them solid. Basics would help create better confidence for recruitment drives.
As Java is quite a dynamic language, it has a lot of aspects to its overall syntax as well as applicability, which is pretty vast to cover in a single article. We have tried to help our readers out by sourcing the most popular and frequently asked questions when it comes to appearing for interviews. Our suggestion would be to pick and choose the best java development course for gaining a 360 degree overview of how you can approach the language’s dynamic nature and the various possibilities it holds.
That said, there are multiple advanced java courses apart from a few interview preparation-related online courses on platforms like Udemy, Coursera as well as edX, which cover everything right from the basic interview questions for Java developers to the more complex, research-oriented ones.
Frequently Asked Question (FAQs) - Top 7 Java developer Interview Questions and Answers
Question: Which are the top recruiters for Java developers?
TCS, HCL, Wipro, HBC Groups, Springer nature, eTeam Info services, C2L Biz, Concourse Solution, worklogix, L&T, JPMorgan, Deutsch, Encore theme, VAct Technologies, GAMSYS, ANSYS, SOLIDWORKS. Any company that has an online presence or would like to build one would have a job opening for a Java developer.
Question: What is the average salary of a fresher and with experience how much would it increase?
For a starting out developer based on his/her skills and merit, the salary can be anywhere in the mid-range of 1 Lakh- 6 Lakh yearly. This depends on the course structure and the college you have attended. After gaining experience and learning a few more courses that could boost your career, an experienced and well trained professional developer can earn upto 7 Lakh- 15 Lakh annually.
Question: How to identify companies that align with my search interests?
Java is used widely and the most known language after C++. IT service companies, electronics companies, mobile companies use Java. So if you are good at core Java then you have many options and companies to choose from. When you specialize in any one Java framework, the scope is defined whether any company works with that framework or not. Many companies build their frameworks with help of core Java which suits their business and many use market-famous frameworks. These can prove as a layer for your choices and help create a better and viable option for your career.
Question: Why is java not completely object-oriented?
It is not completely oriented because of its primitive eight data types boolean, byte, char, int, float, double, long, short.
Question: What is the future scope of Java?
Java will prevail, it would not be easy to eliminate and find a replacement, the demand will see stagnant growth in the coming future and it will still help in generating jobs, creating more solutions to existing problem frameworks.
Question: What are the prerequisites required before learning Java?
If in the preliminary stages, a simple background knowledge of computer language would help create a better understanding of Java and its programming language strategies. Java is quite easy to learn in the basic stage and with progress, it can reach stages that would require immense focus and creative thinking to create innovative solution parameters.
Question: What is the ideal preparation scenario for an interview of an experienced candidate?
Learn about java programming, it's history, and how it works. Try to get the environment set up in your system to get a hang of it. Follow some good tutorials available on sites like Tutorials point, Javatpoint,w3School, etc. for more information on Java and the opportunities, salaries.
Question: Where can I learn Java?
The java course program can be taken at private tuition centers as well as a full-time college degree course. It is also available online with distance learning programs helping students learn without needing to relocate. In today’s time, there are paid and free resources both available offline, and online they can be approached as needed by the student. One can also have a mentor for better guidance or take a counseling session to make things clear and have a clear flow of the plan.
Question: What are the other programming languages I can learn, besides java?
These days, when you talk about programming languages, a lot of them have come up and are rapidly gaining acceptance in the developer community. But predominantly, C++, C, SQL, Python, and Scala are the most preferred options that are chosen as a viable alternative for Java.
Question: What are the best product based companies that hire java developers?
There are numerous companies in that profile, namely, Nvidia, Cisco, Flipkart, Amazon, AOL, Synerzip, Akamai, Yahoo, Google, Microsoft, Cadence, Netapp, MCAfee, Symantec, Philips Electronics, Broadcom, LSI, Intel, Informatica, Citrix, Caterpillar inc, Morgan Stanley, Ebay, Goldman Sachs, AOL, Sun Microsystems, Oracle, Ernst & Young, NetApp. These are just a few companies to name, there are many other options which can provide bright careers prospects for developers.