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Java Interview Questions

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  1. Can you explain what JVM is? Can you use this on any platform that you choose? See answer
  2. How do you adjust your Java coding process when a project starts to run behind schedule? See answer
  3. Can you explain the concept of AJAX and when it’s advantageous to use it in your code? See answer
  4. Have you worked with Java frameworks before? If so, which have you selected and why? See answer
  5. What method do you prefer to use when you are declaring a class in your Java code? See answer
  6. How do you maintain quality code when you have multiple Java projects to complete within tight deadlines? See answer
  7. What’s your Java development process when you’re coming into an existing project and working with other people’s codes?
  8. Can you explain the methods you use to keep your code organized, so it’s easy to work with?
  9. Can you describe the key differences between Java and C++?
  10. How does the JIT compiler work? What benefits does it offer to programmers?
  11. What are Packages and how do they benefit the coding process? Can you provide any examples from your previous experiences?
  12. How do you differentiate between a Bootstrap ClassLoader, Extension ClassLoader and System/Application ClassLoader?
  13. When would you use Javascript? How does Javascript differ from Java?
  14. Can you tell me about a time when you finished coding but discovered defects during testing? How did you troubleshoot the problem and refine your code?
  15. What made you specialize in Java over other programming languages? What makes it more preferable?
  16. What concepts does object-oriented programming (OOPs) include and what do they mean for Java as a programming language?
  17. What is the difference between a String, String Builder and String Buffer? Can you provide me with an example?
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8 Java Interview Questions and Answers

Q:

Can you explain what JVM is? Can you use this on any platform that you choose?

A:

This question tests the applicant’s base-level Java knowledge. If they’re more than passably familiar with Java, they should know the answer to this question. They may stick with a basic definition or go into an in-depth explanation of how it’s used in Java coding.
What to look for in an answer:

  • Understanding the concept of JVM
  • Examples of projects using JVM
  • Examples of their favorite features using JVM

Example:

“JVM stands for Java Virtual Machine. You need the JVM to run any Java application. Without it, the application fails and the user is unable to access it.”

Q:

What’s your Java development process when you’re coming into an existing project and working with other people’s code?

A:

Many projects don’t require coding from scratch. The applicant would work on already developed Java applications and need to adapt to another person’s style. This question determines whether the Java coder can come into existing projects without a problem.
What to look for in an answer:

  • Skill in quickly getting up to speed on someone else’s code
  • Willingness to ask for assistance from team members when they’re unsure about code sections
  • Ability to work with pre-written Java

Example:

“I look through the code and read through the comments left by other Java developers. If I’m not sure how something works, I’ll ask one of my teammates to explain it.”

Q:

How do you adjust your Java coding process when a project starts to run behind schedule?

A:

Project overruns are common in software development, so your applicant should know how to minimize the damage to the schedule. This question gives you a look at their thought processes when it comes to prioritization and how they manage their time when they don’t have enough of it.
What to look for in an answer:

  • Strong sense of what parts of the Java development process to prioritize and how
  • Ability to work under crunch deadlines on a Java project
  • Skill at making the best use of their time while coding with Java

Example:

“I look at the project features needed to meet the minimum viable product requirements for the next milestone. These features are my coding priority until we get back on schedule.”

Q:

Can you explain the method you use to keep your code organized so it’s easy to work with?

A:

You don’t know how long the applicant is going to stay at your company. If they contribute a lot of Java code that’s hard to understand or doesn’t have clear comments throughout, then that makes it harder for other people to work with it.
What to look for in an answer:

  • Willingness to keep code organized to make teammates’ jobs easier
  • Understanding of Java commenting and organizing best practices
  • Experience with working as part of a Java development team

Example:

“After I write a section of code, I go through and comment the most important parts, as well as those that might be confusing for other Java developers to understand later on.”

Q:

Can you explain the concept of AJAX and when it’s advantageous to use it in your code?

A:

This technical question dives deeper into their technical knowledge and the way they’ve used it in the past. You can learn how much they know about Java and whether they’ve worked with particular technologies with this question.
What to look for in an answer:

  • In-depth knowledge of AJAX
  • Ability to explain AJAX clearly and concisely
  • Examples of implementing AJAX in a Java project

Example:

“AJAX pulls data into a web page without needing to refresh the entire page. I typically use this when I want to have an endlessly loading page for users.”

Q:

Have you worked with Java frameworks before? If so, which have you selected and why?

A:

Java frameworks offer excellent time-saving tools for developers, and your organization may use several already. You can learn about the frameworks that the Java developer knows and which they prefer to work with.
What to look for in an answer:

  • Familiarity with Java frameworks
  • Experience working with Java frameworks
  • Ability to explain why they like specific Java frameworks

Example:

“I got my Java coding start working with Spring MVC. This framework has a good combination of versatility and user-friendliness so I could code easier.”

Q:

What method do you prefer to use when you are declaring a class in your Java code?

A:

This technical question tests the applicant’s basic understanding of Java coding. This concept is one of the first things they should pick up when they start to code, and it should be a relatively easy explanation for them.
What to look for in an answer:

  • Clear and confident answer on classes in Java
  • Ability to explain a basic Java concept
  • Knowledge of Java coding

Example:

“I try to create generic classes as much as possible, so I reduce the amount of time I spend creating redundant code. I look at the classes I’m working on and figure out a way to consolidate them into one.”

Q:

How do you maintain quality code when you have multiple Java projects to complete within tight deadlines?

A:

Java professionals may need to work on several coding projects at one time to meet the project needs of their employer. Their ability to maintain their work quality while also meeting deadlines ensures that they support and uphold successful business operations. This question allows interviewers to gauge a candidate's time management and prioritization tactics.

A candidate's answer should emphasize:

  • Time management skills
  • Commitment to quality
  • Ability to multitask

Here is one example of a quality candidate answer:

Example:

"The first thing I do is review the deadlines for each and determine the level of difficulty for each project. This allows me to identify projects that require more time to complete. With this knowledge, I make sure to structure my workday to divide time between easier and more difficult projects. I've also found that taking short breaks throughout the day and coming back to certain projects helps me stay alert and catch mistakes before I submit coding projects."

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