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3,072 engenheiro de software java interview questions shared by candidates

Difference between synchronize map vs concurrent map How is set implemented? Singleton implementation? How Hashmap works ? Coallesce function Join vs Union Arraylist vs linkedlist Microservice – how put is operated with an identifier (URI or payload) Why is string immutable? Spring beans scope SQL Joins/Unions (what and differences) Some Architecture idiot was asking about Chess board game and how to implement horse move!!! (looks like he is enthusiastic to interview and lose sight of acknowledging interviewee is a person like him) – Clearly this question seemed to infer lack of compassion in the company. PS: there is some white-boarding stuff, which I hate the most !!!
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Java Software Engineer

Interviewed at Teradata

3.7★
May 8, 2018

Difference between synchronize map vs concurrent map How is set implemented? Singleton implementation? How Hashmap works ? Coallesce function Join vs Union Arraylist vs linkedlist Microservice – how put is operated with an identifier (URI or payload) Why is string immutable? Spring beans scope SQL Joins/Unions (what and differences) Some Architecture idiot was asking about Chess board game and how to implement horse move!!! (looks like he is enthusiastic to interview and lose sight of acknowledging interviewee is a person like him) – Clearly this question seemed to infer lack of compassion in the company. PS: there is some white-boarding stuff, which I hate the most !!!

Variant of LeetCode 1169. Invalid Transactions and then write a Unit Test to verify the solution. /* Fraud Detection: Find Suspicious Transactions A bank wants to detect fraudulent transactions. A transaction is suspicious if: - The same user makes two transactions within 100 seconds of each other. - A single transaction amount exceeds $10,000. Return a list of users who have made fraudulent transactions. Example Input: transactions = [ { "userId": "Alice", "amount": 5000, "timestamp": 10050 }, { "userId": "Alice", "amount": 2000, "timestamp": 10200 }, { "userId": "Bob", "amount": 12000, "timestamp": 10400 }, { "userId": "Alice", "amount": 6000, "timestamp": 10700 } ] Output: ["Alice", "Bob"] */
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Staff Software Engineer (Java)

Interviewed at Sonar

3★
Sep 8, 2025

Variant of LeetCode 1169. Invalid Transactions and then write a Unit Test to verify the solution. /* Fraud Detection: Find Suspicious Transactions A bank wants to detect fraudulent transactions. A transaction is suspicious if: - The same user makes two transactions within 100 seconds of each other. - A single transaction amount exceeds $10,000. Return a list of users who have made fraudulent transactions. Example Input: transactions = [ { "userId": "Alice", "amount": 5000, "timestamp": 10050 }, { "userId": "Alice", "amount": 2000, "timestamp": 10200 }, { "userId": "Bob", "amount": 12000, "timestamp": 10400 }, { "userId": "Alice", "amount": 6000, "timestamp": 10700 } ] Output: ["Alice", "Bob"] */

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