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Junior Java Developer Interview Questions

"Junior developers are often responsible for writing the more monotonous and simple code required by senior members of the development team. Because of this, interviews will be designed to test your knowledge of the fundamentals of Java so be prepared to answer technical questions that you likely came across in college. Data structures and algorithms will be heavily emphasised. A bachelor's degree or equivalent work experience is required. "

3,803 junior java developer interview questions shared by candidates

Mastek: 1) online mcq technical: Total 31 questions 1 hour. Around 10 to 15 questions were based on core java and remaining were based on spring, web services, and some others also. Core Java questions were simple and mostly on iverloading and overriding . Cut of is low. Round : Technical 1) given an array. Remove duplicates . Don’t use another array, collections. 2) write user defined generic class 3) does hash map store duplicate keys. Why? 4) what will happen if hashcode algo generates same hashcode for different keys. 5) volatile vs transient 6) 4 tread in execution. How do I move ahead In the program only after all 4 threads have terminated. 7) int i = 10; Vs Integer I= 10; where will both the variables be stored. 8) how to increase heap area. 9) serialisation 10) tell me everything about interfaces. 11) tell me everything about object. 12) what will happen if a return in try block. 13) how many catch blocks can u write. 14) u have made notepad app. How to prevent it from creating multiple instances.
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Junior Java Developer

Interviewed at Mastek

3.6★
Dec 10, 2017

Mastek: 1) online mcq technical: Total 31 questions 1 hour. Around 10 to 15 questions were based on core java and remaining were based on spring, web services, and some others also. Core Java questions were simple and mostly on iverloading and overriding . Cut of is low. Round : Technical 1) given an array. Remove duplicates . Don’t use another array, collections. 2) write user defined generic class 3) does hash map store duplicate keys. Why? 4) what will happen if hashcode algo generates same hashcode for different keys. 5) volatile vs transient 6) 4 tread in execution. How do I move ahead In the program only after all 4 threads have terminated. 7) int i = 10; Vs Integer I= 10; where will both the variables be stored. 8) how to increase heap area. 9) serialisation 10) tell me everything about interfaces. 11) tell me everything about object. 12) what will happen if a return in try block. 13) how many catch blocks can u write. 14) u have made notepad app. How to prevent it from creating multiple instances.

One key thing Citibank often asks about during interviews, especially for technical roles, is how you've applied your problem-solving skills in real-world scenarios. This might involve discussing past projects where you've used technologies like Java, SQL, or Spring Framework to solve complex issues, improve systems, or streamline processes. They want to know not only what technologies you know, but also how you’ve effectively used them to deliver results, often tying back to real business problems or improving customer experiences.
avatar

Junior Java Developer

Interviewed at Citi

3.6★
Sep 14, 2024

One key thing Citibank often asks about during interviews, especially for technical roles, is how you've applied your problem-solving skills in real-world scenarios. This might involve discussing past projects where you've used technologies like Java, SQL, or Spring Framework to solve complex issues, improve systems, or streamline processes. They want to know not only what technologies you know, but also how you’ve effectively used them to deliver results, often tying back to real business problems or improving customer experiences.

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