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Ingeniero Java Senior Interview Questions

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5,798 ingeniero java senior interview questions shared by candidates

1. What is runtime polymorphism? Can you explain by writing and example ? 2. Developer d = new Employee(); Here employee is a super class and Developer is a subclass. If we can d.work(); which method will be executed? 3. Can we overload static methods ? 4. In the below array, move all the 0 to left and don't sort the remaining values: 3, 23,0,4,6,0,33,0,34 5. Reverse each string in the word and don't move the punctuations: "Hello, This is a String!" 6. What does a collision happen in Hashmap ? 7. What are different ways to create Thread ?? 8. What is the difference between synchronized block and synchronised method ?? Which is better with respect to performance? 9. If we have static block, a constructer and main method. What is the order of execution? 10. What are the design patterns that you have used in your project? 11. Can you write a program to display singleton design patterns? 12. What are the solid principles?
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Senior Java Engineer

Interviewed at Quest Global

3.9★
May 13, 2025

1. What is runtime polymorphism? Can you explain by writing and example ? 2. Developer d = new Employee(); Here employee is a super class and Developer is a subclass. If we can d.work(); which method will be executed? 3. Can we overload static methods ? 4. In the below array, move all the 0 to left and don't sort the remaining values: 3, 23,0,4,6,0,33,0,34 5. Reverse each string in the word and don't move the punctuations: "Hello, This is a String!" 6. What does a collision happen in Hashmap ? 7. What are different ways to create Thread ?? 8. What is the difference between synchronized block and synchronised method ?? Which is better with respect to performance? 9. If we have static block, a constructer and main method. What is the order of execution? 10. What are the design patterns that you have used in your project? 11. Can you write a program to display singleton design patterns? 12. What are the solid principles?

Stream programs, Java 8 (most questions were from here), multithreading(important), executor service, spring boot annotations, microservices: service registry, pom.xml dependencies, difference between post and put, collections: concurrent hashmap and hashmap difference and internal functioning. Stream program to find index of largest element, find the occurance of each number using stream.
avatar

Senior Java Developer

Interviewed at Bounteous x Accolite

3.4★
Mar 7, 2025

Stream programs, Java 8 (most questions were from here), multithreading(important), executor service, spring boot annotations, microservices: service registry, pom.xml dependencies, difference between post and put, collections: concurrent hashmap and hashmap difference and internal functioning. Stream program to find index of largest element, find the occurance of each number using stream.

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