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Interview Questions and Answers

Q121. Why is JVM called Virtual machine ?

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Q122. In the following code, which text will get printed immediately after Hello

for(int countx=0;countx<10;count++){
System.out.println("World");
for(int countx=0;countx<10;count++){
System.out.println("Friend");
for(int countx=0;countx<10;count++){
System.out.println("Hello");
break;
}
System.out.println("Buddy");
}
}

Core Java

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Q123. In case of generic class declared like following , What can T hold

class MyClass<T>{
T element;
}

Core Java

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Q124. If we have to specify a collection of a particular information like List of addresses, How can we represent that in a JSON ?

JSON

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Q125. Can and Should we mock calls in integration tests ?

Testing

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Q126. What features would you like to see in Java 10 ?

Core Java

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Q127. How do you design microservices?

Design

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Q128. Write a SQL to remove records with a duplicate field in a Table ?

Database

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Q129. How can we make sure that we don't receive duplicate messages from the Kafka Topic ?

Apache Kafka

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Q130. Difference between stateless and stateful rest services ?

Rest

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Q131. Explain Hibernate Validation ?

Hibernate

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Q132. Which validation frameworks have you worked on ?

Frameworks

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Q133. Why was Cassandra written in Java and not C++ ?

Cassandra

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Q134. Why do we use Thread Class as well as Runnable Interface for creating threads in Java ?

Core Java

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Q135. Why can we have a static inner class but not a static Top level class in Java ?

Core Java

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Q136. If a team member send you the code for review which you don't agree to but is just slightly off , Would you approve it or reject it ?

General

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Q137. How do you keep yourself aupdated with the changes in technologies ?

General

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Q138. How would you describe your current or previous Boss ?

General

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Q139. What do you do when told to do something that you don't agree with?

General

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Q140. In a Tree, find common ancestor of two nodes.

Data Structures

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Q141. Which Data structure can be used for creating Queue ?

Data Structure

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Q142. What is a BlockingQueue ?

Core Java

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Q143. Which of the two - Arrays or LinkedList - is a better data structure for implementing Queue ? and Why ?

Data Structure

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Q144. What is the difference between Kan Ban and Agile ? Which one do you prefer ?

Process

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Q145. How is LinkedList collection class internally implemented ? Is it a Linked List or Doubly Linked List ?

Core Java

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Q146. What are annotations and what are it's advantages ?

Core Java

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Q147. Suppose we have a string "Java is object oriented language" and we have to reverse every alternate word in string. How would we do that using Java program.

Core Java

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Q148. How much by default filling ratio in HashMap ?

Core Java

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Q149. What is a double ended queue?

Core Java

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Q150. Why did you choose programming ?

General

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