Luxoft Senior Software Engineer Interview Questions and Answers

Q1. Approach to resolve memory leak
Ans. 
Memory leaks can be resolved by identifying the source of the leak and freeing up the allocated memory.
• Use memory profiling tools to identify the source of the leak

• Analyze the code to find any unnecessary memory allocations

• Ensure all allocated memory is freed up after use

• Use smart pointers or garbage collection to automate memory management

• Test thoroughly to ensure the issue is resolved
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Q2. Approach to resolve memory
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Memory issues can be resolved by identifying and fixing memory leaks, optimizing memory usage, and using appropriate data structures.
• Identify and fix memory leaks using tools like Valgrind or AddressSanitizer

• Optimize memory usage by reducing unnecessary allocations and deallocations

• Use appropriate data structures like arrays, linked lists, and hash tables

• Avoid using global variables and excessive recursion

• Consider usin...read more
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Q3. What is static storage class
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Static storage class is used to declare variables that have a lifetime throughout the program execution.
• Variables declared with static storage class are initialized only once and retain their value between function calls.

• They have a default value of 0 if not initialized explicitly.

• Static functions and variables are only visible within the file they are declared in.

• Static variables can be used to count the number of tim...read more
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Q1. Create Custom annotation
Ans. 
Custom annotations can be created using @interface in Java.
• Create a new interface with @interface keyword

• Add required elements and default values

• Use the annotation by adding @ followed by the annotation name

• Example: @CustomAnnotation(value = "example")

• Annotations can be used for compile-time checks or runtime behavior
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Q2. Memory management in Java 8
Ans. 
Java 8 uses automatic memory management through garbage collection.
• Java 8 uses a garbage collector to automatically manage memory.

• The garbage collector frees up memory by removing objects that are no longer in use.

• Java 8 introduced the G1 garbage collector which is designed to reduce pause times.

• Developers can also use tools like jmap and jstat to monitor memory usage.
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Q3. What algo Java 8 Garbage collector follow
Ans. 
Java 8 Garbage collector follows the algorithm called G1 (Garbage-First).
• G1 divides the heap into regions and collects garbage in small portions called 'garbage-first' regions.

• It uses multiple parallel threads for garbage collection.

• G1 aims to minimize pause times by dynamically adjusting the amount of garbage collected in each region.

• It uses a combination of young and old generation collection to achieve better perfor...read more
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Q4. @retension annotation
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Q5. Java Design Patterns
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Q6. What is SOLID Principal? and Explain L into it?
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SOLID is a set of principles for object-oriented programming. L stands for Liskov Substitution Principle.
• SOLID principles help in creating maintainable and scalable software.

• Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the correctness of the program.

• This principle ensures that the behavior of the program remains consistent even ...read more
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Average coding test on arrays and string

Q1. Java 8 features, Microservices, Springboot features, kafka, docker and kubernetes, security
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Q1. Previous experience, technical insight, discussion on work culture
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Q1. 1)How to calculate time complexity of contains method 2)Java 8 program
Ans. 
Calculating time complexity of contains method in Java 8
• Time complexity of contains method in Java 8 is O(n)

• It depends on the size of the collection and the type of collection used

• For example, for ArrayList, it is O(n), for HashSet, it is O(1)

• Java 8 introduced a new method called contains(Object o, Predicate filter) which has a time complexity of O(n)

• The contains method is used to check if a collection conta
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Q2. Spring Boot question
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Q1. WAP to count Duplicate String using Java 8
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WAP to count Duplicate String using Java 8
• Use Java 8 Stream API to group and count duplicate strings

• Create a Map to store the count of each string

• Filter the map to get only the strings with count > 1

• Return the size of the filtered map as the number of duplicate strings
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Q2. Basic Questions on Collections framework , Spring boot
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Q1. Previous experience and basic questions on the worked technology
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Q1. Previous experience and few technical and HR questions not hard
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Q1. Why luxoft, why are you changing job
Ans. 
I am changing jobs to join Luxoft because of their strong reputation in the software engineering industry.
• Luxoft has a proven track record of delivering high-quality software solutions.

• I am impressed by the company's focus on innovation and cutting-edge technologies.

• Luxoft offers excellent career growth opportunities and a supportive work environment.

• I believe that joining Luxoft will allow me to further enhance my ski...read more
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