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Backend Java Developer Interview Questions

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517 backend java developer interview questions shared by candidates

Apenas perguntas sobre trabalho atual, experiências com ferramentas relacionadas. Entrevista técnica voltada unicamente ao ecossistema Java e Spring. Não há pegadinhas nem perguntas parecidas com leetcode/hackerrank.
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Java Backend Developer

Interviewed at BairesDev

4.2★
Feb 15, 2023

Apenas perguntas sobre trabalho atual, experiências com ferramentas relacionadas. Entrevista técnica voltada unicamente ao ecossistema Java e Spring. Não há pegadinhas nem perguntas parecidas com leetcode/hackerrank.

SQL storedProcedure to aggregate data from 3 tables, and calculate remaining available seats, similar to one on chegg, "You're working on the tech support team of an airline company, and your boss has asked you to implement a feature that shows the number of available seats on every flight. Information about the airline is stored in three tables"
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Java Backend Engineer, Platform

Interviewed at Zoom Communications

3.4★
Mar 5, 2021

SQL storedProcedure to aggregate data from 3 tables, and calculate remaining available seats, similar to one on chegg, "You're working on the tech support team of an airline company, and your boss has asked you to implement a feature that shows the number of available seats on every flight. Information about the airline is stored in three tables"

1. Difference between Arraylist and linkedlist. 2. What is the time complexity of insertion in linkedlist? 3. Which one do you prefer in which condition? 4. Which one do you use to insert an array of integers? 5. Given two lists - remove all the elements of second list from first list. 6. Employee class - Employee1 emp1 = ID:1, name : ABC Employee2 emp2 = ID:1, name : ABC Treemap map = new TreeMap<>(); map.put(emp1,7); map.put(emp2,8); Is this allowed? What will be the size of the treemap in this case? 7. Internal implementation of put method in treemap. 8. Internal implementation of hashcode and equals in object class. 9. Time complexity of removeAll() in Linkedlist
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Java Backend Developer ()

Interviewed at Wissen Infotech

3.8★
Jan 14, 2021

1. Difference between Arraylist and linkedlist. 2. What is the time complexity of insertion in linkedlist? 3. Which one do you prefer in which condition? 4. Which one do you use to insert an array of integers? 5. Given two lists - remove all the elements of second list from first list. 6. Employee class - Employee1 emp1 = ID:1, name : ABC Employee2 emp2 = ID:1, name : ABC Treemap map = new TreeMap<>(); map.put(emp1,7); map.put(emp2,8); Is this allowed? What will be the size of the treemap in this case? 7. Internal implementation of put method in treemap. 8. Internal implementation of hashcode and equals in object class. 9. Time complexity of removeAll() in Linkedlist

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