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Interview Questions and Answers - Order By Newest

Q1991. Is dependency injection possible if we don't have inheritance / Composition ?

Ans. Without composition - No, as it's the core of dependency injection.

With Inheritance - Yes, through interface implementation.

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Q1992. Why is Java such an important Programming language ?

Core Java

Ans. Because of following features

Object Oriented and hence helps build maintainable and easily enhanceable code.
Platform Independence and hence can be executed anywhere
Fast due to JIT compiler

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Q1993. Why Java is considered more purer object oriented language than C++ ?

Core Java

Ans. Because of

lack of use of pointers,
Lack of structural programming and
Lack of Multiple Inheritance

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Q1994. Does Wrapper classes produces immutable objects ?

Core Java

Ans. Yes

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Q1995. Why shouldn't we use string concatenation extensively or in a loop ?

Core Java

Ans. Because String being an immutable object creates a new object upon each concatenation cycle. If there is any such need , we should use String Builder whose objects are mutable.

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Q1996. What do we mean by a Data Type ?

Core Java

Ans. if you have similar type of data or objects or entities, then we can give them a type with unique name. And this name will be our Data type.

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Q1997. As root, if you have to assign the owner for the file and set only read permission for the owner, Write a unix command to do it.

Unix

Ans. chmod 477

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Q1998. 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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Q1999. Which of the two - iteration or recursion - is slower ?

Core Java

Ans. Any function call is slower than the code in the same method as Java has to maintain stack of meta and function call information. So recursion is slower.

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Q2000. In case of generic class declared like following , What can T hold

class MyClass<T>{
T element;
}

Core Java

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Q2001. 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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Q2002. Which type of testing involves use of mocking frameworks ?

Testing

Ans. Unit Testing

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Q2003. Can and Should we mock calls in integration tests ?

Testing

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Q2004. What features would you like to see in Java 10 ?

Core Java

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Q2005. Can we instantiate the object of derived class if parent constructor is private ?

Core Java

Ans. No

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Q2006. How do you design microservices?

Design

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Q2007. Can an enum extend another enum ?

Core Java

Ans. No

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Q2008. Can we have a sub enum within an enum ?

Core Java

Ans. Yes

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Q2009. Write a SQL to remove records with a duplicate field in a Table ?

Database

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Q2010. How can we make sure that we don't receive duplicate messages from the Kafka Topic ?

Apache Kafka

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Q2011. If a Map needs to be accessed simultaneously by multiple threads, which collection class should be used ?

Core Java

Ans. ConcurrentHashMap

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Q2012. Given a collection of Employee objects, how can we get the customers with name starting with 'A' using lambda expression.

Core Java

Ans. List emp = Arrays.asList("American", "Indian", "Finn");
emp.stream().filter(em -> em.startsWith("A")).forEach(System.out.println);

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Q2013. What is the difference between stream and parallel stream ?

Core Java

Ans. streams are used for sequential processing of data and parallel streams are used for parallel processing of data (only if the underlying processor is multicore).

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Q2014. Difference between stateless and stateful rest services ?

Rest

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Q2015. How can we makes sure that message has been consumed properly from Kafka ?

Apache Kafka

Ans. We can have a mechanism to send the conformation back to Kafka so that Kafka can do offset only after receiving the confirmation.

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Q2016. What are the advantage of Abstract classes over interfaces with respect to Java 7 ? and What changed in Java 8 to help facilitate that in Java 8 ?

Core Java

Ans. Abstract Classes provide default implementations of methods that are inherited by the classes that extend them, which was not the case for Interfaces. This changed in Java 8, where default implementations are provided for methods.

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Q2017. Explain Hibernate Validation ?

Hibernate

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Q2018. Which validation frameworks have you worked on ?

Frameworks

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Q2019. Can we mock static methods ?

Testing

Ans. Yes we can use PowerMock. With Mockito , we cannot mock static methods.

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Q2020. Kafka has a deliver atleast once default Policy, What are the other policies that can be configured with Kafka ?

Apache Kafka

Ans. Exactly once and At Max Once

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