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Interview Questions and Answers

Q101. What are the different ORMs supported by Spring ?

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Q102. What are the different types of advices in AOP ?

Spring

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Q103. What is weaving in Spring ?

Spring

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Q104. How to calculate lcm of two numbers ?

Core Java

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Q105. What is a session bean ?

Java EE

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Q106. Design a class diagram for a farm.

Design

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Q107. Explain Java 8 concurrency mechanism.

Core Java

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Q108. Can we synchronize the run() method in Java?

Core Java

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Q109. What are the worst anti patterns in Java ?

Design

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Q110. Write a Program to check if the entered number is a Duck Number ( Number having 0 in it ) ?

Core Java

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Q111. what are different pointer operators used ?

Core Java

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Q112. What is mutable in Java ?

Core Java

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Q113. Which java features makes java different from other languages ?

Core Java

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Q114. Why cant we start an identifier with a number in Java?

Core Java

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Q115. What is the default data type of Serialized methods?'

Core Java

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Q116. Write a Program to implement stack using LinkedList.

Data Structure

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Q117. Describe how you could use a single array to implement three stacks

Algorithm

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Q118. How would you design a stack which, in addition to push and pop, also has a function min which returns the minimum element? Push, pop and min should all operate in O(1) time

Algorithm

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Q119. Write a program to sort a stack in ascending order You should not make any assumptions about how the stack is implemented The following are the only functions that should be used to write this program: push | pop | peek | isEmpty

Algorithm

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Q120. Why is JVM called Virtual machine ?

Core Java

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Q121. 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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Q122. In case of generic class declared like following , What can T hold

class MyClass<T>{
T element;
}

Core Java

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Q123. 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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Q124. Can and Should we mock calls in integration tests ?

Testing

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Q125. What features would you like to see in Java 10 ?

Core Java

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Q126. How do you design microservices?

Design

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Q127. Write a SQL to remove records with a duplicate field in a Table ?

Database

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Q128. How can we make sure that we don't receive duplicate messages from the Kafka Topic ?

Apache Kafka

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Q129. Difference between stateless and stateful rest services ?

Rest

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Q130. Explain Hibernate Validation ?

Hibernate

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