![]() ![]() Here, the interviewer is likely looking for information about the new keyword. Each object has a state in which all the member variables have specific values. While a class is a logical entity, an object is a physical entity. This is a variation of the previous question that forces the interviewee to define both classes and objects.Ī class is a template used for the creation of objects whereas an object is an instance of a class. You can learn more about classes and objects in our tutorial: Classes and Objects in Java What is the difference between a class and an object? A class can contain fields and methods to describe the state and behavior of an object. A class is a blueprint from which individual objects are created. They are so fundamental that you really can’t write even the most basic program without one. In an OOP language like Java, classes are the bedrock. You can learn more about popular Java IDEs in our roundup: The Top Java IDEs. NetBeans is another good choice.īecoming familiar with Java developer tools like application performance monitors and collaboration tools is also a good idea. If not, take some time to get acquainted with the top two – Eclipse and IntelliJ IDEA – at the very least. Hopefully you have used at least one IDE prior to your interview. You can learn more about OOP concepts in the following tutorial: What is Object-oriented programming in Java? Which Java IDE Do You Use?Īn IDE (or Integrated Development Environment) is a software application that increases developer productivity by combining capabilities such as software editing, building, testing, and packaging in an easy-to-use application. The user can create additional threads by extending the thread class or by implementing the Runnable interface. JVM creates a thread which is called the main thread.
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