Informatica Principal Software Engineer Interview Questions and Answers

Q1. Java related questions when the interview was not language specific
Add your answer

Q1. Question were regarding the AWS
Add your answer

Q1. Singleton Pattern in details
Ans. 
Singleton pattern ensures a class has only one instance and provides a global point of access to it.
• Ensures a class has only one instance by providing a global access point to it.

• Uses a private constructor to restrict instantiation of the class.

• Provides a static method to access the singleton instance.

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or logging.

• Exampl...read more
Answered by AI
Add your answer
Q2. Difference between POJO and Bean
Ans. 
POJO is a Plain Old Java Object with private fields and public getters/setters, while a Bean is a Java class with private fields and public zero-argument constructors.
• POJO stands for Plain Old Java Object

• POJO has private fields and public getters/setters

• Bean is a Java class with private fields and public zero-argument constructors

• Beans are usually used in Java EE frameworks like Spring for dependency injection
Answered by AI
Add your answer
Q3. Product of an array except self
Ans. 
Calculate the product of all elements in an array except for the element itself.
• Iterate through the array and calculate the product of all elements except the current element.

• Use two separate arrays to store the product of elements to the left and right of the current element.

• Multiply the corresponding elements from the left and right arrays to get the final result.
Answered by AI
Add your answer

Q1. String a = "Something" String b = new String("Something") How many object created?
Ans. 
Two objects created - one in the string pool and one in the heap.
• String 'a' is created in the string pool, while String 'b' is created in the heap.

• String pool is a special area in the heap memory where strings are stored to increase reusability and save memory.

• Using 'new' keyword always creates a new object in the heap, even if the content is the same as an existing string in the pool.
Answered by AI
Add your answer
Q2. Predict Output based on whether static variables can be accessed from non-static method
Ans. 
Static variables can be accessed from non-static methods using an object reference or by making the variable non-static.
• Static variables can be accessed from non-static methods by creating an object of the class containing the static variable.

• Alternatively, the static variable can be made non-static to be accessed directly from a non-static method.

• Attempting to access a static variable directly from a non-static method
Answered by AI
View 2 more answers
Q3. Java 8 Features
Add your answer

Q1. Write code to emulate Producer/Consumer Problem
Ans. 
Emulate Producer/Consumer Problem using code
• Create a shared buffer between producer and consumer

• Use synchronization mechanisms like mutex or semaphore to control access to the buffer

• Implement producer and consumer functions to add and remove items from the buffer respectively
Answered by AI
Add your answer
Q2. Write code to create a deadlock
Ans. 
Creating a deadlock involves two or more threads waiting for each other to release a resource they need.
• Create two threads, each trying to lock two resources in a different order

• Ensure that one thread locks resource A first and then tries to lock resource B, while the other thread locks resource B first and then tries to lock resource A

• This will result in a situation where each thread is waiting for the other to releas
Answered by AI
Add your answer
Q3. Write code to implement LRU Cache
Ans. 
Implement LRU Cache using a data structure like LinkedHashMap in Java
• Use LinkedHashMap to maintain insertion order

• Override removeEldestEntry method to limit cache size

• Update the access order on get and put operations
Answered by AI
Add your answer
Q4. Write code two merge and remove duplicates from two sorted arrays with any Collections
Ans. 
Merge and remove duplicates from two sorted arrays without using Collections
• Use two pointers to iterate through both arrays simultaneously

• Compare elements at each pointer and add the smaller one to the result array

• Skip duplicates by checking if the current element is equal to the previous element
Answered by AI
Add your answer
Q5. Questions related to Java Commands used to start a java program (mvn related)
Add your answer
Q6. Java Memory Model
Add your answer
Q7. Write code to start 5 threads
Ans. 
Code to start 5 threads in Java
• Create a class that implements the Runnable interface

• Instantiate 5 objects of the class

• Create 5 threads using the objects and start them
Answered by AI
Add your answer
Q8. String a = "Something" a.concat(" New") What will be garbage collected?
Ans. 
Only the original string 'Something' will be garbage collected.
• The concat method in Java does not modify the original string, but instead returns a new string with the concatenated value.

• In this case, 'a' remains as 'Something' and a new string 'Something New' is created, but not assigned to any variable.

• Since the new string is not stored in any variable, it will not be garbage collected.
Answered by AI
Add your answer
Q9. Write code to read a file
Ans. 
Code to read a file in Java
• Use FileReader and BufferedReader classes to read the file

• Handle exceptions using try-catch blocks

• Close the file after reading using close() method
Answered by AI
Add your answer

Design an circular linked list

Went through the previous projects and asked some design question

I had 6 interviews held one after other without sharing feedback and in last they rejected

Q1. About spark basics
Add your answer
Q2. Ds and algorithm interview
Add your answer

Q1. Webtable object handling
Add your answer
Q2. Multiple window handles
Ans. 
Multiple window handles allow a browser to interact with multiple windows simultaneously.
• Window handles are unique identifiers assigned to each window opened by a browser.

• Using multiple window handles, you can switch between different windows, interact with their elements, and perform actions.

• Example: driver.getWindowHandles() in Selenium returns a set of window handles for the current session.
Answered by AI
Add your answer

Q1. Sql, bash, Middleware and docker
Add your answer

It is was a screening test and was given a coding problem to be solved in given time frame.

Also a coding round with a interviewer giving problem statement or situation and we need to understand the same provide solution on that problem. After explaining the solution need to code for the same keeping in mind the space and time complexity for the code. We need to explain each step that we are going to write into the code. Question will be asked based on the code.

Q1. Managerial round
Add your answer