January 18, 2024

Top 5 Java interview questions and answers you need to know

Cogent Infotech
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Dallas, TX
January 18, 2024

Are you a Java developer looking to explore new opportunities? Or are you looking to crack your first interview as a Java developer? If the answer is yes, then this article is for you! Cogent University presents - 5 questions popularly asked in Java interviews.

What are the 4 principal concepts of Object-Oriented Programming?

  • Abstraction: Hiding the implementation details and only providing functionality to users
  • Encapsulation: Wrapping up the data and code into a single unit
  • Inheritance: Making a class acquire the properties of another class
  • Polymorphism: The ability of an object, variable, or function to assume multiple forms

Why would you use garbage collection in Java?

Garbage collection can identify (and subsequently discard) the objects that are not required by the application anymore.

Is it possible to override a static or private method in Java?

No.Creating a similar method in a child class using the same method arguments and the return type will hide the superclass method (method hiding). 

What are the rules for creating a Java constructor?

  • The constructor name must be the same as the class name
  • The constructor cannot have any explicit return type

What is the primary difference between wait() and sleep()?

While wait() calls on an object, sleep() will call on a thread. 


Are you looking to accelerate your career in Java? Cogent University offers an 8-week JAVA Bootcamp with guaranteed placement on successful completion of the course.

 Looking for more? Here are the next Top 25 Java Interview questions you should prepare for your next interview!

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