Wissen Technology Interview Questions, Process, and Tips for Experienced

6 question , 2 coding questions

Q1. Coding question ds min platforms
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Q2. SQL question students table
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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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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
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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
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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
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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
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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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Q1. What is the contract between hashCode and equals method?
Ans. 
The contract between hashCode and equals method is that if two objects are equal according to the equals method, then their hash codes must also be equal.
• hashCode and equals method must be consistent - if two objects are equal according to equals method, their hash codes must be equal

• If two objects have the same hash code, they may or may not be equal according to equals method

• Overriding equals method in a class requir...read more
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Q2. Features introduced in Java 8
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods in interfaces.
• Lambda expressions allow you to pass functions as arguments.

• Functional interfaces have a single abstract method and can be used with lambda expressions.

• Streams provide a way to work with sequences of elements.

• Default methods allow interfaces to have method implementations.
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Q3. What are the ways to start a thread
Ans. 
Ways to start a thread in Java
• Extending the Thread class and overriding the run() method

• Implementing the Runnable interface and passing it to a Thread object

• Using a thread pool from the Executors class
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Q4. What will happen if you start a thread which is already running
Ans. 
The thread will continue running as it is already active
• The thread will not be started again if it is already running

• Attempting to start a thread that is already running will not have any effect

• The thread will continue its execution without any interruption
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Q5. Explain about the join and sleep method
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Join method is used to wait for a thread to finish its execution, while sleep method is used to pause the execution of a thread for a specified amount of time.
• Join method is used to wait for a thread to finish its execution before moving on to the next task.

• Sleep method is used to pause the execution of a thread for a specified amount of time, allowing other threads to run.

• Example: thread1.join() will wait for thread1 ...read more
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Q1. What is lifecycle hook of Angular
Ans. 
Lifecycle hooks in Angular are methods that allow you to tap into the lifecycle of a component or directive.
• Lifecycle hooks include ngOnInit, ngOnChanges, ngDoCheck, ngOnDestroy, etc.

• ngOnInit is used to initialize data in a component after Angular has initialized the component.

• ngOnChanges is called when the input properties of a component change.

• ngDoCheck is used for detecting and acting on changes that Angular doesn't...read more
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2 dsa questions and 1 sql question in hackerearth.

Q1. Asked to check pallindrome or noit
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Q2. Design a deck of card and tell who is the higher bidder
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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.)
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