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Core Java Developer Interview Questions

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92 core java developer interview questions shared by candidates

1. what is java polymorphism - how java implements polymorphism? 2. purpose of volatile keyword 3. can top level class be declared static? 4. when is object.finalise method, when is it called? 5. Can we syncronise the static method 6. Can we invoke non static method from static method on same class 7. Producer and consumer pattern explain?? 8. Which design pattern u used in ur projects? 9. Describe heirarchy of exception class 10. Java collection api - describe a few? 11. Describe transient variable 12. Describe final keyword 13. Multithreading - how to create multiple thread, describe how to start new thread 14. Difference between runnable and callable 15. Difference between treemap and hashmap? 16. String, string builder and string buffer differences 17. Java io apis which u used -? 18. Singleton pattern - explain 19. How do you make class singleton.
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Senior Core Java Developer

Interviewed at Citi

3.6★
Jun 25, 2016

1. what is java polymorphism - how java implements polymorphism? 2. purpose of volatile keyword 3. can top level class be declared static? 4. when is object.finalise method, when is it called? 5. Can we syncronise the static method 6. Can we invoke non static method from static method on same class 7. Producer and consumer pattern explain?? 8. Which design pattern u used in ur projects? 9. Describe heirarchy of exception class 10. Java collection api - describe a few? 11. Describe transient variable 12. Describe final keyword 13. Multithreading - how to create multiple thread, describe how to start new thread 14. Difference between runnable and callable 15. Difference between treemap and hashmap? 16. String, string builder and string buffer differences 17. Java io apis which u used -? 18. Singleton pattern - explain 19. How do you make class singleton.

Interview process was Easy, Java 8 features , Lambda expressions, Functional interface, Optional class, How to achieve Immutability, SCP area Heap area Fibonacci program, Rest APi Post Put Get Delete Patch @Qualifer Annotation HashMap internal working and HashMap related program Can you have try with catch ? Have you worked on any feature that helped client? How you worked on 8 story points ?
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Core Java Analyst

Interviewed at Deloitte

3.8★
Nov 10, 2021

Interview process was Easy, Java 8 features , Lambda expressions, Functional interface, Optional class, How to achieve Immutability, SCP area Heap area Fibonacci program, Rest APi Post Put Get Delete Patch @Qualifer Annotation HashMap internal working and HashMap related program Can you have try with catch ? Have you worked on any feature that helped client? How you worked on 8 story points ?

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