Software Developer Java Interview Questions

4,192 software developer java interview questions shared by candidates

Phone interview questions: What are the methods of an Object? How do you call a constructor? How do you call Super? What is a default method? Difference between abstract and interface? If you Have an Elephant class and an Animal class, and you call one as the other which one do you need to cast and vice versa? Code reading questions: Can you tell whether the class extended is an abstract class or an interface? What is a Singleton ? What is a Semaphore? What is a socket? What is a throwable? Does the finally block in the try catch blocks execute (the try block returned if a socket was reachable)? System Design questions: You can pick an option out of 3 options, Design a pet care shop, a Car dealership, a card game. The Care Dealership had automobiles with features. And the Dealership needed to keep track of cars sold, and registered as well as offer features.
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Associate Java Software Developer

Interviewed at Expeditors

3.3
May 22, 2019

Phone interview questions: What are the methods of an Object? How do you call a constructor? How do you call Super? What is a default method? Difference between abstract and interface? If you Have an Elephant class and an Animal class, and you call one as the other which one do you need to cast and vice versa? Code reading questions: Can you tell whether the class extended is an abstract class or an interface? What is a Singleton ? What is a Semaphore? What is a socket? What is a throwable? Does the finally block in the try catch blocks execute (the try block returned if a socket was reachable)? System Design questions: You can pick an option out of 3 options, Design a pet care shop, a Car dealership, a card game. The Care Dealership had automobiles with features. And the Dealership needed to keep track of cars sold, and registered as well as offer features.

L1: 1.static binding vs dynamic binding 2.write singleton class 3. If we have list in singleton class how we avoid accessing it outside the class. 4. how to make singleton synchronized 5.java 8 - functional interface and stream API 6. write a program in java 8 max sal of employee 7.@variable & @modifier in JPA 8. why we use marker interface 9. how spring security works, authentication vs authorization 10. what is serialization? why we use is 11. what is transient 12. what is marker interface 13.internal implementation of hashset. L2: 1.aggregation in mongodb 2. mongodb groupby query 3. JPA integration with mongodb 4.microservice architecture 5. kafka producer consumer problem 6. project description. 7. agile methodology 8. Project build related question. 9 . Development process related questions

Senior Software Developer (Java)

Interviewed at NeoSoft

3.5
Sep 24, 2023

L1: 1.static binding vs dynamic binding 2.write singleton class 3. If we have list in singleton class how we avoid accessing it outside the class. 4. how to make singleton synchronized 5.java 8 - functional interface and stream API 6. write a program in java 8 max sal of employee 7.@variable & @modifier in JPA 8. why we use marker interface 9. how spring security works, authentication vs authorization 10. what is serialization? why we use is 11. what is transient 12. what is marker interface 13.internal implementation of hashset. L2: 1.aggregation in mongodb 2. mongodb groupby query 3. JPA integration with mongodb 4.microservice architecture 5. kafka producer consumer problem 6. project description. 7. agile methodology 8. Project build related question. 9 . Development process related questions

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