Lumen Technologies Java Developer Interview Questions and Answers

Aptitude test is the round of i step to enter the compition

Q1. What is method overloading and method overriding
Ans. 
Method overloading is creating multiple methods with the same name but different parameters. Method overriding is creating a new implementation of an existing method in a subclass.
• Method overloading is used to provide different ways of calling the same method with different parameters.

• Method overriding is used to change the behavior of an existing method in a subclass.

• Method overloading is resolved at compile-time base...read more
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Q2. What is polymorphism
Ans. 
Polymorphism is the ability of an object to take on many forms.
• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It is achieved through method overriding and method overloading.

• Example: A parent class Animal can have child classes like Dog, Cat, and Bird. All these child classes can have their own implementation of the method 'makeSound', but they can be treated as Animals.

• ...read more
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Q3. Can we overload the constructer
Ans. 
Yes, we can overload the constructor in Java.
• Overloading constructor means creating multiple constructors with different parameters.

• The constructors can have different number of parameters or different types of parameters.

• The constructor with the matching parameters will be called during object creation.
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Q4. What is data type
Ans. 
Data type is a classification of data based on the type of value it holds.
• Data type determines the type of operations that can be performed on the data.

• Examples of data types include integer, float, boolean, and string.

• Data types can be primitive or non-primitive.

• Primitive data types are predefined by the language and non-primitive data types are created by the programmer.
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It was not difficult ..it was good ..overall experience was good

Not too difficult ...array realated question were asked

Graph and Dynamic programming related 2 questions

Q1. Greedy algorithm Java related questions asked.
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Q1. Except for Rafael aircraft, what else does India has to do with France.
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Q1. Check if the linked list is palindrome or not
Ans. 
To check if a linked list is a palindrome, compare the first half of the list with the reversed second half.
• Traverse the linked list to find the middle node

• Reverse the second half of the linked list

• Compare the first half with the reversed second half to check for palindrome
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Q2. C string questions
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Q1. Operating systems questions
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Q2. Linked list and system design question
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Q1. Questions related to project mentioned in CV. Questions around reliability, availability, scalability of system.
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Q2. 2 medium coding questions on arrays and hashmap.
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Q1. Golang basics, goroutines, channels.
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Q2. Coding questions on a shared board
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Q1. Deep dive into the work at current company and projects.
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Q2. How interprocess communications take place, how goroutines communicate internally, quite in-depth questions, varying over several domains.
Ans. 
Interprocess communication involves various mechanisms like pipes, sockets, shared memory, etc. Goroutines communicate using channels and shared memory.
• Interprocess communication can be achieved through mechanisms like pipes, sockets, shared memory, message queues, etc.

• Goroutines in Go communicate internally using channels, which are typed conduits through which you can send and receive values.

• Shared memory can also be...read more
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Q3. Design a URL shortener service
Ans. 
Design a URL shortener service
• Generate a unique short code for each URL

• Store the mapping of short code to original URL in a database

• Redirect users from short URL to original URL

• Consider scalability and performance of the service

• Implement analytics to track usage statistics
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Coding test was comprising of mcq based questions on db, oops, c++ and java

Q1. It was a high intense interview. Interview starts with introduction and some resume based questions. Then, followed by deep networking and os based questions. Then, dsa questions were asked specifically on...read more
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Q1. It was also a tough one. Questions were specifically on project based of the resume and other questions were on btech curriculum, subjects, and experience.
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Q1. HR was easy. Questions were only about relocation and package breakup. But remember that they can put you in waiting and when needed they can call for another interview. So mark this and all the best.
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Q1. Basic question of .net was asked
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Coding test on hackerrank

Q1. Question on Tree
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Q2. Asked to solve a few puzzles
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