CodeNation Software Developer Interview Questions and Answers

Technology advantage or not

All aptitude topics,logical reasoning

Q1. Oops,2 coding questions
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Q2. Palindrome,even number
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Q1. What do you know
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Q2. Do you have any questions
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Q1. What is Dependency Injection?
Ans. 
Dependency Injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
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Q2. How to handle exception in java
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In Java, exceptions can be handled using try-catch blocks to catch and handle specific exceptions.
• Use try-catch blocks to catch exceptions and handle them gracefully

• Use multiple catch blocks to handle different types of exceptions

• Use finally block to execute code regardless of whether an exception is thrown or not

• Throw custom exceptions using throw keyword
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Q1. In Java8, different between flatmap and map
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map transforms each element in a stream, while flatMap transforms each element into multiple elements
• map applies a function to each element in a stream and returns a new stream of the results

• flatMap applies a function that returns a stream for each element in the original stream, then flattens the streams into a single stream

• Example: map - stream.map(x -> x * x), flatMap - stream.flatMap(str -> Arrays.stream(str.split(
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Q2. How to handle the ConcureentModificationException
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ConcurrentModificationException occurs when a collection is modified while iterating over it.
• Use Iterator to iterate over the collection instead of foreach loop.

• If modification is necessary, use Iterator's remove() method instead of collection's remove() method.

• Consider using synchronized collections or ConcurrentHashMap to avoid ConcurrentModificationException.
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Q1. Difference between linked list and array list
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Linked list is a data structure where elements are stored in nodes with pointers to the next node. Array list is a dynamic array that can grow or shrink in size.
• Linked list allows for efficient insertion and deletion of elements anywhere in the list.

• Array list provides fast access to elements using index, but slower insertion and deletion compared to linked list.

• Example: Linked list - 1 -> 2 -> 3 -> 4 -> 5, Array list
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Q2. Difference between @controller and @ Rest controller
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The @Controller annotation is used for traditional MVC controllers, while @RestController is used for RESTful web services.
• The @Controller annotation is used to define a class as a Spring MVC controller, which can handle HTTP requests and return a view.

• The @RestController annotation is used to define a class as a controller for RESTful web services, which can handle HTTP requests and return data in JSON or XML format.

• T...read more
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Q1. Why do you want to switch
Ans. 
I want to switch to explore new technologies and challenges in a different industry.
• Interested in learning new skills and technologies

• Seeking new challenges and opportunities for growth

• Want to explore different industry perspectives
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Q2. Salry expectations
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Q1. Question on oop concepts
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Q2. Coding questions
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Q1. Basic core Java question.
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Technical round was really good

Q1. What is binary search
Ans. 
Binary search is a search algorithm that finds the position of a target value within a sorted array.
• Divide and conquer approach

• Compares target value with middle element of array

• If target value is smaller, search left half; if larger, search right half

• Repeat process until target value is found or subarray is empty
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Q2. Binary search and time
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Q3. What is linked list
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A linked list is a data structure consisting of nodes where each node contains a data field and a reference to the next node in the sequence.
• Linked list elements are not stored in contiguous memory locations like arrays.

• Each node in a linked list contains data and a reference to the next node.

• Linked lists can be singly linked (each node points to the next node) or doubly linked (each node points to both the next and pr
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Q4. Tree data structure
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Q5. Avl tree and write code
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I was asked with writing the code and algorithms. Also lots of MySQL queries

Q1. Oops related questions
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Q2. How you can handle exceptions in case of inheritance
Ans. 
Exceptions in inheritance can be handled by using try-catch blocks in the derived class.
• Use try-catch blocks in the derived class to catch exceptions thrown by the base class methods.

• Handle exceptions specific to the derived class in the catch block.

• Consider using super() to call the base class constructor within the try block.

• Avoid catching general exceptions unless necessary to maintain code clarity.

• Ensure proper exc...read more
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Q3. Collections questions
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Q4. Live coding based on the answers you give
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Q5. Your current project and how you handled difficulties in that
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