10+ Wissen Technology Software Developer Interview Questions and Answers

Design a deck of cards and determine the higher bidder

• Design a deck of 52 cards with 4 suits (hearts, diamonds, clubs, spades) and 13 ranks (2-10, J, Q, K, A)

• Assign a value to each rank (e.g. 2 = 2, 3 = 3, ..., J = 11, Q = 12, K = 13, A = 14)

• Determine the higher bidder based on the rules of the game being played (e.g. highest card wins, poker hand rankings, etc.)

Primary key uniquely identifies a record in a table, while super key is a set of attributes that can uniquely identify a record.

• Primary key is a subset of super key

• Primary key cannot have NULL values, while super key can

• Example: In a table 'Employee', 'EmployeeID' can be a primary key as it uniquely identifies each employee record, while 'EmployeeID, DepartmentID' can be a super key

Implementing prime number printing, linked list, and binary search on array in software development interview question.

• Implement a function to print prime numbers within a given range

• Create a linked list class with basic operations like insertion, deletion, and traversal

• Write a binary search function to find a target value in a sorted array

Optimizing prime number algorithms is crucial for efficient computation in software development.

• Optimizing prime number algorithms can improve the performance of applications that rely on prime numbers, such as cryptography or number theory.

• Efficient algorithms like the Sieve of Eratosthenes can significantly reduce the time complexity of finding prime numbers.

• Using techniques like memoization or dynamic programming can further optimize prime number generation.

• Optimizing prim...read more

Constructors are used to initialize objects, while overriding functions in HashMap allows custom behavior for key-value pairs.

• Constructors in HashMap are used to initialize the HashMap object with a specified initial capacity and load factor.

• Overriding functions in HashMap allows custom behavior for methods like put(), get(), and remove().

• Example: Overriding the put() method in a custom HashMap implementation to perform additional validation before adding a key-value pair.

Create a React application based on given requirements

• Start by setting up a new React project using create-react-app

• Identify the components needed based on the requirements

• Implement state management using React hooks or Redux

• Fetch data from an API if required and display it in the application

• Ensure responsive design and user-friendly interface

Abstraction is the concept of hiding complex implementation details and showing only the necessary information. Encapsulation is bundling data and methods that operate on the data into a single unit.

• Abstraction focuses on what an object does rather than how it does it

• Encapsulation restricts access to some of an object's components, protecting the object's integrity

• Abstraction allows for easier maintenance and modification of code

• Encapsulation helps in achieving data hiding an...read more

Use sorting or heap data structure to find k largest elements in an array of strings.

• Sort the array in descending order and return the first k elements.

• Use a max heap data structure to efficiently find the k largest elements.

• Examples: ['apple', 'banana', 'orange', 'kiwi'], k=2 -> ['orange', 'kiwi']

OOPs concepts refer to Object-Oriented Programming principles such as inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features.

Remove duplicates from array of strings

• Create a Set to store unique strings

• Iterate through the array and add each string to the Set

• Convert the Set back to an array to get the unique strings

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed again to find the index and then the linked list is searche...read more

A program to find the next palindrome number after a given number.

• Convert the given number to a string to easily manipulate individual digits.

• Increment the number by 1 and check if it is a palindrome.

• If not a palindrome, repeat the process until a palindrome is found.