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Software Developer Java Interview Questions

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4,317 software developer java interview questions shared by candidates

What are the oops concepts you have used? What is abstraction? Difference between abstraction and interface. Explain with real life example. Can we change the dispatcher servlet's XML making file name? How to debug a JavaScript? Spring MVC flow. What is a controller? Where and how is the request mapped? What is serializable, what care needs to be taken if you serialize a class? What care needs to be taken to convert an object to be serializable? Saving part as well, what streams need to be used?
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Senior Software Engineer (Java)

Interviewed at Cognizant

3.5★
Dec 28, 2015

What are the oops concepts you have used? What is abstraction? Difference between abstraction and interface. Explain with real life example. Can we change the dispatcher servlet's XML making file name? How to debug a JavaScript? Spring MVC flow. What is a controller? Where and how is the request mapped? What is serializable, what care needs to be taken if you serialize a class? What care needs to be taken to convert an object to be serializable? Saving part as well, what streams need to be used?

Heap memory vrs stack memory Classloader. types of classloader spring boot annotations that i have used? LinkedList insertion and deletion from particular index Exception, Errors Number of Leader Elements Multithreading Synchronized block Static keyword in java constructor injection
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Software Engineer - Java Developer

Interviewed at Oracle

3.5★
Oct 1, 2021

Heap memory vrs stack memory Classloader. types of classloader spring boot annotations that i have used? LinkedList insertion and deletion from particular index Exception, Errors Number of Leader Elements Multithreading Synchronized block Static keyword in java constructor injection

Overall easy interview. Basic questions were asked from all topics mentioned in the resume. Java 8 features, code on stream api, collections, sql, spring core questions, dependency injection, tree set, hashset, working of hashmap.
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Software Engineer - Java Developer

Interviewed at Cognizant

3.5★
Oct 1, 2021

Overall easy interview. Basic questions were asked from all topics mentioned in the resume. Java 8 features, code on stream api, collections, sql, spring core questions, dependency injection, tree set, hashset, working of hashmap.

The questions asked where basic Java questions like Overriding, Polymorphism, Abstraction, Interface, Use of Hashcode and equals() method, Serilization concepts. Second interview questions: Here the questions went little deeper in Java like internal structure of hashmap and also questions on sql.
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Java Software Engineer

Interviewed at Cognizant

3.5★
Nov 22, 2016

The questions asked where basic Java questions like Overriding, Polymorphism, Abstraction, Interface, Use of Hashcode and equals() method, Serilization concepts. Second interview questions: Here the questions went little deeper in Java like internal structure of hashmap and also questions on sql.

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