Java interview questions

In this blog, we will tell you about the 6 most faced Java interview questions. This will help you prepare well for your interview round as well as give you some extra knowledge on Java.

Edustrom provides training on Core & Adv Java, Core Java and Adv Java.

We understand how interviews can make you all nervous and confused. It is very important that you stay calm and just focus clearly. Hear the questions and answer accordingly. Also, the best tip to get through an interview is confidence but certainly not overconfidence.

If you are unable to answer any question just simple say – I am sorry but I don’t know the answer right now but I will definitely make sure to find out or simply I am sorry but I don’t know the answer to this question. Don’t makeup answers and just blabber anything. It will be a big drawback for you.

So, without any further delay, let’s see what those 6 questions from Java are that will certainly be asked in an interview –

Interview Questions for Java –

1.       Why is Java not 100% object-oriented?

2.       Why is the Java platform independent?

3.       What is a map in Java?

4.       What is a copy constructor in Java?

5.       Why pointers are not used in Java?

6.       What is JDK?

Let us begin –

1.       Why is Java not 100% object-oriented?
Ans- Java is not 100% Object-oriented because it uses eight primitive data types that are not objects. Such as -
(i) Boolean
(ii) Byte
(iii) Char
(iv) Int
(v) Float
(vi) Double
(vii) Long
(viii) Short

2.       Why is the Java platform independent?
Java is platform-independent because of its byte codes which are capable of running on any system irrespective of the underlying operating system.

3.       What is a map in Java?
Map in Java is an interface that maps unique keys to values. It is not a subset so it behaves a little differently from the other collection types. Also, it does not include duplicate keys and each key can value max one value.

4.        What is a copy constructor in Java?
It is a member function used to initialize an object using another object of the same class. However, there is no need for a copy constructor in Java as all the objects are passed by reference.

5.       Why pointers are not used in Java?
Pointers are unsafe and increases the complexity of the program. Since java is known for its simplicity, adding pointers will become very contradicting. Also, direct access to memory by the user is avoided and that is why pointers are discouraged in Java.

6.       What is JDK?
JDK stands for Java Development Kit. It is a tool that helps in compiling, documenting, and packaging Java programs. It contains JRE and development tools.  

With this, we come to the end of this blog. We hope that these 6 interview questions will help you to prepare for your next interview!

If you have any doubts related to the courses that we offer, kindly contact us and our team will get in touch with you as soon as possible.

Check our Courses on Core Java, Advanced Java, and Core +Advanced Java, and enroll yourself today!

All the Best!

Edustrom provides you with a platform to learn variously Java Applications and helps you master them within a limited time frame like ( i ) String Handling, ( ii ) Swing, ( iii ) Layout Management, ( iv ) Applet ( v ) JDBC, ( vi ) Java new features, and ( vii ) OOPS Concept. 

Why Choose Edustrom?
Edustrom provides you thorough details on the Java course. Also, we make your future-ready by giving you industrial training and a chance to work on live ongoing projects. So, your knowledge can excel with the experience. We also provide you with a certificate stating that you are now ready to enter the industrial world. And moreover, we have a team of experts to look after your query and doubts round the clock.