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Sr Java Entwickler Interview Questions

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411 sr java entwickler interview questions shared by candidates

Core Java-Collections, Serialization, Multi-threading, OOPS concepts, SOLID Principles, Design Pattern with implementation, Spring Boot, JPA, HIbernate, SQL queries, AWS Services- Lambda, Fargate, Docker, Kubernatives, S3 configuration. Coding - Arrays, Strings, LinkedList Java Stream lambda for custom class
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Senior Software Engineer - Java Developer

Interviewed at GlobalLogic

3.8★
May 11, 2024

Core Java-Collections, Serialization, Multi-threading, OOPS concepts, SOLID Principles, Design Pattern with implementation, Spring Boot, JPA, HIbernate, SQL queries, AWS Services- Lambda, Fargate, Docker, Kubernatives, S3 configuration. Coding - Arrays, Strings, LinkedList Java Stream lambda for custom class

1st Technical Round: 1. Method overriding rules? 2. Output? • //classes will compile fine bcos both r throwing run time exceptions • class TestOverride { • void solution() throws NullPointerException { • System.out.println("super"); • } • } • • class TestSubOverride extends TestOverride { • void solution() throws RuntimeException { • System.out.println("sub"); • } • } 2. Given array {4,5,6,1,2,4}; how do u search particular element ex:1? Ans: he was looking for best search algorithm – ans is binary search algorithm 3. Consider I have huge data which is stored randomly, which data structure is best for retrieval with performance of O(1)? Ans: Hashmap bcos of performance O(1) always 4. Write a code to delete a node from LinkedList 5. Write a simple code for Threading. 6. What is difference between callable and Runnable? 7. What is functional interface? 8. Why functional interface should have only one abstract method why not more than one? 9. When we use lamda expressions? 10. What is difference between IOC and dependency injection? 11. Why do we need dependency injection? 12. Scopes of bean in spring? 2nd Technical Round: 1. Why Java is so popular? In depth answer 2. Given Name, write code to print all combinations using that. 3. Given array, {1,2,3,4,5,6,7,8} and {4,1,2,5,1,2,3,4,5,6,7,8}, at any given position how do you find out array is sorted or not. (Circular sorting)
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Senior Software Engineer - Java Developer

Interviewed at Oracle

3.5★
Jul 9, 2018

1st Technical Round: 1. Method overriding rules? 2. Output? • //classes will compile fine bcos both r throwing run time exceptions • class TestOverride { • void solution() throws NullPointerException { • System.out.println("super"); • } • } • • class TestSubOverride extends TestOverride { • void solution() throws RuntimeException { • System.out.println("sub"); • } • } 2. Given array {4,5,6,1,2,4}; how do u search particular element ex:1? Ans: he was looking for best search algorithm – ans is binary search algorithm 3. Consider I have huge data which is stored randomly, which data structure is best for retrieval with performance of O(1)? Ans: Hashmap bcos of performance O(1) always 4. Write a code to delete a node from LinkedList 5. Write a simple code for Threading. 6. What is difference between callable and Runnable? 7. What is functional interface? 8. Why functional interface should have only one abstract method why not more than one? 9. When we use lamda expressions? 10. What is difference between IOC and dependency injection? 11. Why do we need dependency injection? 12. Scopes of bean in spring? 2nd Technical Round: 1. Why Java is so popular? In depth answer 2. Given Name, write code to print all combinations using that. 3. Given array, {1,2,3,4,5,6,7,8} and {4,1,2,5,1,2,3,4,5,6,7,8}, at any given position how do you find out array is sorted or not. (Circular sorting)

spring ioc containers, dependency injection, spring mvc architecture, annotations, hibernate, jpa, spring security, database queries, deployment process, micro services, java concepts like streams, functional interface, collections, strings, java mail. Aws services like EC2, Ses. Docker deployments. Maven build system.
avatar

Senior Software Engineer - Java

Interviewed at Happiest Minds Technologies

3.7★
Oct 12, 2021

spring ioc containers, dependency injection, spring mvc architecture, annotations, hibernate, jpa, spring security, database queries, deployment process, micro services, java concepts like streams, functional interface, collections, strings, java mail. Aws services like EC2, Ses. Docker deployments. Maven build system.

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