IDFC FIRST Bank Java Developer Interview Questions and Answers

Simple algorithm question about sorting

Q1. Algorith question about quick sort
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Q2. Nlonn run time of the sort
Ans. 
The time complexity of the quicksort algorithm is O(n log n).
• Quicksort has an average time complexity of O(n log n).

• The best case time complexity of quicksort is O(n log n) when the pivot element divides the array into two equal halves.

• The worst case time complexity of quicksort is O(n^2) when the pivot element is the smallest or largest element in the array.
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It had more than 30 aptitude questions and 2 coding questions

Q1. It was totally a tech round all questions were from Data structure, dbms, java, computer networking
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Q1. What is one keyword which can be used so that value of variable cannot be changed
Ans. 
final keyword can be used to make a variable's value constant and unchangeable
• Use 'final' keyword before the variable declaration

• Once a variable is declared as final, its value cannot be changed

• Example: final int num = 10; // value of num cannot be modified
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Q2. Have you heard about deadlock ?
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Yes, deadlock is a situation in concurrent programming where two or more threads are waiting for each other to release resources, causing them to be stuck indefinitely.
• Deadlock occurs when two or more threads are blocked forever, waiting for each other to release resources.

• It can happen when multiple threads have locks on different resources and each thread is trying to acquire a lock held by another thread.

• Example: Th...read more
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Q3. Tell the approach to print the unique elements from a arraylist
Ans. 
Use a HashSet to store unique elements from the arraylist
• Create a HashSet and add all elements from the arraylist to it

• Since HashSet does not allow duplicates, only unique elements will be stored

• Convert the HashSet back to an arraylist if needed
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Q4. When can a conflict arise while working with git and github
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Conflicts can arise in git and github when multiple developers make changes to the same file or branch simultaneously.
• Conflicts can occur when two developers make changes to the same line of code in a file.

• Conflicts can also arise when merging branches that have diverged and contain different changes.

• Communication among team members is crucial to avoid conflicts and resolve them efficiently.

• Using pull requests and code...read more
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Q5. Why spring has came into picture? What are the features it provides
Ans. 
Spring came into picture to simplify Java development by providing features like dependency injection, aspect-oriented programming, and transaction management.
• Spring provides dependency injection which helps in managing object dependencies and promotes loose coupling.

• It supports aspect-oriented programming for separating cross-cutting concerns like logging, security, and transaction management.

• Spring offers robust tran...read more
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Q6. What is polymorphism
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Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: A superclass Animal with methods eat() and sleep(). Subclasses Dog and Cat override these methods with their own imp
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Q7. What is collection framework
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Collection framework in Java is a set of classes and interfaces that provide a way to store and manipulate groups of objects.
• It provides a way to store, retrieve, and manipulate groups of objects.

• It includes interfaces like List, Set, and Map, and classes like ArrayList, HashSet, and HashMap.

• Collections framework simplifies the process of working with collections of objects in Java.
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Q8. Difference between map and set
Ans. 
Map is a collection of key-value pairs where keys are unique, while Set is a collection of unique elements with no duplicates.
• Map allows duplicate values but keys must be unique

• Set does not allow duplicate elements

• Map is accessed using keys, while Set is accessed using elements

• Example: Map - {1: 'apple', 2: 'banana'}, Set - {'apple', 'banana'}
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Q9. Which is best choice arraylist or linkedlist when space is not an issue?
Ans. 
ArrayList is a better choice when space is not an issue due to its constant time access, while LinkedList has better performance for insertions and deletions.
• ArrayList is better for random access as it provides constant time access to elements based on index.

• LinkedList is better for insertions and deletions as it does not require shifting elements in memory.

• Example: If you need to frequently add or remove elements in a...read more
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Q10. Do you know about javafx jsp
Ans. 
JavaFX is a software platform for creating and delivering desktop applications, while JSP is a technology used for creating dynamic web pages.
• JavaFX is used for creating rich internet applications with a modern look and feel.

• JSP is used for developing dynamic web pages with Java code embedded in HTML.

• JavaFX and JSP can be used together to create interactive web applications.
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Q1. 1. Power BI, 2. SQL,
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Q2. 3. Azure and 4. Excel.
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Joins, Jobs, stored procedures,cursors.

Q1. What is my package
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Q1. Mental trauma and frustrated scenarios Even after solving 3 Link list coding problem and 20+ technical questions, and then following up about 20 times, and even after calls and emails, there has been no...read more
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Q2. Even after solving 3 coding problem and 20+ technical questions, and then following up about 20 times, and even after calls and emails, there has been no response. Would it be appropriate for me to post ...read more
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