Wissen Technology Interview Questions, Process, and Tips

Q1. Median of two sorted arrays - Interviewer expects you to write internet solution not the optimal one 🤦‍♂️
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Prepare online aptitude tests

Q1. Oops concepts details
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Q2. AWS , DevOps, python
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Q1. Willing to relocate
Ans. 
Yes, I am willing to relocate for the right opportunity.
• I am open to relocating for a promising career opportunity.

• I have relocated in the past for job opportunities and am comfortable with the process.

• I understand the importance of being flexible and adaptable in the tech industry.
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Q2. 3years bond manditory
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Had multiple choice question on java, code snippet, two coding question (easy), one sql query

Q1. One sql query to find the highest salary from each department from Employee database.
Ans. 
Use SQL query to find highest salary from each department in Employee database.
• Use GROUP BY clause to group results by department.

• Use MAX() function to find highest salary in each group.

• Join Employee table with Department table to get department information.
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Q2. Merger two sorted array,
Ans. 
Merge two sorted arrays into a single sorted array.
• Create a new array with the combined length of the two input arrays

• Use two pointers to iterate through the two input arrays and compare elements

• Add the smaller element to the new array and move the pointer for that array forward

• Repeat until all elements from both arrays are added to the new array
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Q3. Flatten an array
Ans. 
Flatten an array of strings
• Use a recursive function to iterate through the array and flatten it

• Check if each element is an array, if so, recursively call the function

• Concatenate the elements into a single array
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Q1. Given 3 threads print a number from 1 to 10 in sequence
Ans. 
Use synchronized blocks or locks to ensure threads print numbers in sequence.
• Use synchronized blocks or locks to ensure only one thread can access the shared resource (number to be printed) at a time.

• Use a shared variable to keep track of the current number to be printed and update it after each thread prints its number.

• Use a loop to iterate from 1 to 10 and have each thread check if it is its turn to print the number.
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Q2. Core Java related questions
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1st Round was Written Coding test Q> Next Palindrome, Q> ATM machine design Q> SQl query Q> Elephant and banana Prime number Story base question

Q1. Find the Next Palindrome
Ans. 
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.
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Q2. Prime number optimisation and why ?
Ans. 
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 ca...read more
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Q1. Write a java program to count the number of vowels in a string
Ans. 
Java program to count vowels in a string
• Create a method that takes a string as input

• Use a loop to iterate through each character in the string

• Check if the character is a vowel (a, e, i, o, u) and increment a counter

• Return the counter as the result
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Q2. Write Xpath for Google search button
Ans. 
Xpath for Google search button
• Use the following Xpath: //input[@name='btnK']

• The 'btnK' is the name attribute of the Google search button

• Make sure to test the Xpath in a browser console to ensure accuracy
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Q3. Explain OOPS concept
Ans. 
OOPS concept refers to Object-Oriented Programming principles like 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 detail
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Q4. Implicit and Explicit wait in Selenium
Ans. 
Implicit and Explicit waits are used in Selenium to handle synchronization issues in web automation testing.
• Implicit wait is used to tell the WebDriver to wait for a certain amount of time before throwing a NoSuchElementException.

• Explicit wait is used to tell the WebDriver to wait for a certain condition to occur before proceeding further.

• Implicit wait is set globally for the entire WebDriver instance, while explicit w...read more
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Q5. Difference between throw n throws
Ans. 
In software testing, 'throw' is used to raise an exception, while 'throws' is used to declare exceptions that a method may throw.
• throw is used to raise an exception in a program

• throws is used in method signature to declare exceptions that the method may throw

• throw is a keyword in Java, while throws is a keyword used in method declaration
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Q6. Solve a pseudo code
Ans. 
Solving a pseudo code problem in an interview for Junior Engineer - Quality Assurance
• Understand the logic of the pseudo code provided

• Identify the variables and operations being performed

• Write the code in a programming language of your choice to solve the problem

• Test the code with different inputs to ensure it works correctly
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