Nagarro Java Developer Interview Questions and Answers

Reasoning topics,Java logica programming

Q1. Oops concepts java Database in SQL
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Q2. Introduction your self
Ans. 
I am a Java Developer with 5 years of experience in developing web applications.
• I have a strong understanding of Java programming language and its frameworks like Spring and Hibernate.

• I have experience in developing RESTful APIs and working with databases like MySQL and Oracle.

• I am familiar with front-end technologies like HTML, CSS, and JavaScript.

• I have worked on projects that involved integrating third-party APIs an...read more
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Q3. Oops concepts java College academy project
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Q1. 1. How can we break Singleton class?
Ans. 
Singleton class can be broken using reflection, serialization, cloning, and multi-threading.
• Reflection can be used to access the private constructor and create multiple instances.

• Serialization can create multiple instances when the object is deserialized.

• Cloning can create a new instance of the Singleton class.

• Multi-threading can create multiple instances if not synchronized properly.
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Q2. 2. Why we use SerialVersionUID? and what if my ID do not match?
Ans. 
SerialVersionUID is used to ensure version compatibility of serialized objects.
• SerialVersionUID is a unique identifier assigned to a serializable class.

• It is used to ensure that the serialized object can be deserialized correctly even if the class definition has changed.

• If the SerialVersionUID of the serialized object does not match the one in the class definition, an InvalidClassException is thrown.

• To avoid this, it i...read more
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Q3. 3. How can we prevent circular dependency in Spring?
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Circular dependency in Spring can be prevented by using constructor injection or setter injection.
• Use constructor injection to inject dependencies

• Use setter injection to inject dependencies

• Use @Autowired annotation to inject dependencies

• Use @Qualifier annotation to specify which bean to inject

• Use @Lazy annotation to delay bean initialization

• Use @DependsOn annotation to specify bean dependencies

• Use @ComponentScan annota
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There was a coding test to write 2 java program

First round we have 3 coding questions based on arrays , strings , Linked list

Q1. In this round the interviewer asked java questions based on oops multithreading and dsa question based on heaps, array , LinkedList
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