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Citicorp Senior Java Developer Interview Questions and Answers
7 Interview questions
Stream API is a feature in Java that allows processing collections of objects in a functional style.
Stream API provides a way to perform operations on collections like filter, map, reduce, etc.
It supports functional programming paradigms like lambda expressions.
Example: List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); Stream<String> stream = names.stream();
Lambda expressions are anonymous functions that allow you to pass behavior as an argument to a method.
Lambda expressions are used to provide a concise way to represent behavior as data.
They are commonly used in functional programming and can be used to implement functional interfaces.
Lambda expressions can be used to iterate through collections using the forEach method.
Object-oriented programming concepts that help in organizing and designing code for reusability and maintainability.
Encapsulation: Bundling data and methods that operate on the data into a single unit (class).
Inheritance: Allowing a class to inherit properties and behavior from another class.
Polymorphism: Ability of objects to take on multiple forms or types.
Abstraction: Hiding the implementation details and showi...
Java 8 introduced several new features including lambda expressions, functional interfaces, and streams.
Lambda expressions allow for more concise and functional programming style.
Functional interfaces enable the use of lambda expressions.
Streams provide a powerful way to process collections of data in a functional manner.
Default methods in interfaces allow for adding new methods to existing interfaces without brea...
What people are saying about Citicorp
Handle out-of-memory exception by analyzing heap dump and optimizing code.
Analyze heap dump to identify memory leaks
Optimize code to reduce memory usage
Increase heap size if necessary
Use memory profiling tools like JProfiler or VisualVM
Avoid creating unnecessary objects
Use caching to reduce object creation
Implement garbage collection strategies
Shallow and deep comparison in Strings with code example
Shallow comparison checks if two String variables refer to the same object in memory
Deep comparison checks if two String variables have the same sequence of characters
Shallow comparison can be done using the '==' operator
Deep comparison can be done using the 'equals()' method
Example: String str1 = 'hello'; String str2 = 'hello'; str1 == str2; //shallow compar...
A Spring Boot application follows a predefined flow of execution.
Application starts with main() method
Spring Application Context is initialized
Beans are created and dependencies are injected
Application starts serving requests
Requests are handled by Controllers and Services
Responses are returned to the client
Citicorp Senior Java Developer Interview Experiences
2 interviews found
Manoj Cheulwar
Selected
I applied via Naukri.com and was interviewed before Feb 2023. There was 1 interview round.
(5 Questions)
- Q1. Java oops concepts , Java memory model , Java, lambda expressions example
- Q2. What are the oops concepts
- Ans.
Object-oriented programming concepts that help in organizing and designing code for reusability and maintainability.
Encapsulation: Bundling data and methods that operate on the data into a single unit (class).
Inheritance: Allowing a class to inherit properties and behavior from another class.
Polymorphism: Ability of objects to take on multiple forms or types.
Abstraction: Hiding the implementation details and showing on...
- Q3. What is stream api
- Ans.
Stream API is a feature in Java that allows processing collections of objects in a functional style.
Stream API provides a way to perform operations on collections like filter, map, reduce, etc.
It supports functional programming paradigms like lambda expressions.
Example: List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); Stream<String> stream = names.stream();
- Q4. What is lambda expressions
- Ans.
Lambda expressions are anonymous functions that allow you to pass behavior as an argument to a method.
Lambda expressions are used to provide a concise way to represent behavior as data.
They are commonly used in functional programming and can be used to implement functional interfaces.
Lambda expressions can be used to iterate through collections using the forEach method.
- Q5. What Java memory model
- Ans.
The Java memory model defines how threads interact through memory when accessing shared data.
Defines the rules for reading and writing to shared variables in a multithreaded environment
Ensures visibility of changes made by one thread to other threads
Specifies the order in which operations are executed and how they are synchronized
Interview Preparation Tips
Skills evaluated in this interview
I applied via Job Portal and was interviewed in Aug 2020. There was 1 interview round.
Interview Questionnaire
4 Questions
- Q1. 1. What are the Java 8 Features you've worked with?
- Ans.
Java 8 introduced several new features including lambda expressions, functional interfaces, and streams.
Lambda expressions allow for more concise and functional programming style.
Functional interfaces enable the use of lambda expressions.
Streams provide a powerful way to process collections of data in a functional manner.
Default methods in interfaces allow for adding new methods to existing interfaces without breaking ...
- Q2. How will you handle an out-of-memory exception?
- Ans.
Handle out-of-memory exception by analyzing heap dump and optimizing code.
Analyze heap dump to identify memory leaks
Optimize code to reduce memory usage
Increase heap size if necessary
Use memory profiling tools like JProfiler or VisualVM
Avoid creating unnecessary objects
Use caching to reduce object creation
Implement garbage collection strategies
- Q3. Difference between shallow and deep comparision in Strings with code example.
- Ans.
Shallow and deep comparison in Strings with code example
Shallow comparison checks if two String variables refer to the same object in memory
Deep comparison checks if two String variables have the same sequence of characters
Shallow comparison can be done using the '==' operator
Deep comparison can be done using the 'equals()' method
Example: String str1 = 'hello'; String str2 = 'hello'; str1 == str2; //shallow comparison ...
- Q4. Flow of a String Boot Application
- Ans.
A Spring Boot application follows a predefined flow of execution.
Application starts with main() method
Spring Application Context is initialized
Beans are created and dependencies are injected
Application starts serving requests
Requests are handled by Controllers and Services
Responses are returned to the client
Interview Preparation Tips
Skills evaluated in this interview
Interview questions from similar companies
Software Developer Interview Questions & Answers
State Street Corporation
Anonymous
posted on 20 May 2017
I appeared for an interview in May 2017.
Interview Questionnaire
6 Questions
- Q1. Can string class be extended
- Ans.
Yes, the string class can be extended in most programming languages.
Inheritance can be used to extend the functionality of the string class.
By creating a new class that inherits from the string class, additional methods and properties can be added.
Extending the string class allows for customization and adding specific functionality to strings.
Example: In Python, the string class can be extended by creating a new class ...
- Q2. What are the implecit object in JSP
- Ans.
Implicit objects in JSP are predefined objects that are available for use without any declaration or initialization.
Implicit objects in JSP include request, response, session, application, out, config, pageContext, page, exception, and others.
These objects provide access to various aspects of the JSP environment and can be used to perform common tasks.
For example, the request object allows access to HTTP request parame...
- Q3. How does hash map works
- Ans.
A hash map is a data structure that uses a hash function to map keys to values.
Hash map stores key-value pairs
It uses a hash function to compute an index for each key
Collisions can occur when two keys hash to the same index
Hash maps provide fast access to values based on their keys
- Q4. Difference between string buffer and string builder
- Ans.
StringBuffer and StringBuilder are both used to manipulate strings, but StringBuffer is thread-safe while StringBuilder is not.
StringBuffer is synchronized, making it safe for use in multi-threaded environments.
StringBuilder is not synchronized, making it faster but not thread-safe.
StringBuffer is preferred when multiple threads are involved, while StringBuilder is preferred for single-threaded scenarios.
Both classes p...
- Q5. What is MVC
- Ans.
MVC is a software architectural pattern that separates an application into three main components: Model, View, and Controller.
Model represents the data and business logic of the application.
View is responsible for displaying the user interface.
Controller handles user input, updates the model, and interacts with the view.
MVC promotes separation of concerns and modularity in software development.
Example: In a web applica...
- Q6. What are the annotation used in RESTFULL web services
- Ans.
Annotations used in RESTful web services
1. @Path - Specifies the URI path for the resource
2. @GET - Specifies that the method handles HTTP GET requests
3. @POST - Specifies that the method handles HTTP POST requests
4. @PUT - Specifies that the method handles HTTP PUT requests
5. @DELETE - Specifies that the method handles HTTP DELETE requests
6. @PathParam - Binds the value of a URI template parameter to a method paramete...
Interview Preparation Tips
Skills evaluated in this interview
Interview Preparation Tips
Experience: Technical on paper test questions:(dis was only for 12 among d 26 shortlisted ppl after apti...others directly had interviews)
5 wer selected in this test who wer nw sent for interviews
TECHNICAL INTERVIEW: (pls list the questions asked in all the rounds)
26 shortlisted after apti (14 directly for interviews & 12 had one more technical on paper test...mentioned above)
der wer min 2 technical rounds for each of them...max were 5
- You are given course dependencies
A->B,C
B->D
C->A
D->nothing
The above dependencies mean...if you want to take course A...you should take courses B and C first....To take B,Course D must be taken first....D is an independent course and can be taken without any prior requirements.
Now you are told these dependencies.Come up with an appropriate data structure to represent these dependencies.Then write a code that finds out all the courses that the student can take up...in this case the student can first take course D because its independent.Now that course D has been taken he can next take up B as it depends on B alone...But the courses A and C can never be taken because they depend on each other...So here all the courses that can be taken are B and D.
After i wrote the code....he asked for all possible test cases
-Given an array of length N....It can be filled with nos. only from 1 to N....find which nos are repeated in the array
-Given pointers to two nodes in a binary tree....find their least common ancestor...each node has pointer to only the parent node...not the left and right child..
-In a binary tree(Not necessarily a BST)...suppose the weight of any node is defined as the product of the key value of the node and the level of the node(Root at level 1)...find the node with maximum weight in the binary tree
-A sorted array of size n is right circularly rotated k times and this rotated array is given to you as input...Find out the value of k in log n time .
-There are some processes running at time T....and there are processes running at time T+30.
You have to find out
1)Which processes died at time T+30,which were alive at time T
2)Which are the new processes at time T+30,which were not there at time T
3)Which are the processes that were there at time T and are still running at time T+30
What data structure will you use to represent the process lists and write code to find out the answers to the 3 questions above
-Given a binary search tree...and a target sum...starting at the root...which all paths add up to the target sum?...if there are multiple paths....return the path with least no. of nodes.
College Name: Veermata Jijabai Technological Institute, Mumbai [ VJTI ]
What people are saying about Citicorp
I appeared for an interview before Mar 2021.
(3 Questions)
Round duration - 90 minutes
Round difficulty - Medium
There were 33 questions in total. The objective questions were simple.
- Q1.
Sort Big List Dates Problem Statement
Mary is an enthusiastic party-goer who struggles with remembering event dates. Help Mary by sorting a given list of event dates in an ascending order.
Example:
Inpu...
- Ans.
Sort a list of event dates in ascending order based on year, month, and day.
Sort the list of dates based on year, then month, and finally day.
Use a sorting algorithm to rearrange the dates in ascending order.
Ensure the constraints are met for each date in the list.
- Q2.
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
... - Ans.
Given an array and a target sum, find all pairs of elements that add up to the target sum.
Iterate through the array and for each element, check if the complement (target sum - current element) exists in a hash set.
If the complement exists, add the pair to the result list.
Sort the pairs based on the first element and then the second element.
Handle edge cases like duplicate elements and pairs with the same values.
Example...
- Q3.
Maximum Sum Problem Statement
Given an integer
N, your task is to recursively break it into three integer parts:N / 2,N / 3, andN / 4. You need to compute the maximum sum possible by dividing the numbe... - Ans.
Given an integer N, recursively break it into three parts and find the maximum sum possible.
Recursively divide N into N/2, N/3, and N/4 to find the maximum sum
Compare the sum obtained by dividing N with the sum of N itself
Return the maximum sum for each test case
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more
Skills evaluated in this interview
I appeared for an interview before Mar 2021.
(3 Questions)
Round duration - 60 minutes
Round difficulty - Medium
Technical Interview round with questions based on DSA.
- Q1.
Duplicate Integer in Array
Given an array
ARRof sizeN, containing each number between 1 andN-1at least once, identify the single integer that appears twice.Input:
The first line contains an integer... - Ans.
Identify the duplicate integer in an array containing numbers between 1 and N-1.
Iterate through the array and keep track of the frequency of each element using a hashmap.
Return the element with a frequency greater than 1 as the duplicate integer.
Ensure the constraints are met and a duplicate number is guaranteed to be present.
- Q2.
Sum Root to Leaf Numbers
You are given an arbitrary binary tree consisting of N nodes, each associated with an integer value from 1 to 9. Each root-to-leaf path can be considered a number formed by concat...
- Ans.
Calculate the total sum of all root to leaf paths in a binary tree formed by concatenating node values.
Traverse the binary tree from root to leaf nodes, keeping track of the current path sum
Add the current node value to the path sum and multiply by 10 for each level
When reaching a leaf node, add the final path sum to the total sum
Return the total sum modulo (10^9 + 7)
- Q3.
Topological Sort Problem Statement
You are given a directed acyclic graph (DAG). Your task is to perform topological sorting of the graph and return any valid ordering.
Explanation:
A directed acyclic g...
- Ans.
Implement a function to perform topological sorting on a directed acyclic graph (DAG) and return any valid ordering.
Create a graph data structure to represent the DAG
Use depth-first search (DFS) to perform topological sorting
Maintain a visited array to keep track of visited nodes
Return the ordering of nodes after DFS traversal
(3 Questions)
Round duration - 60 minutes
Round difficulty - Easy
Technical interview round with questions based on DSA.
- Q1.
LCA of Binary Tree Problem Statement
You are given a binary tree consisting of distinct integers and two nodes,
XandY. Your task is to find and return the Lowest Common Ancestor (LCA) of these two nodes... - Ans.
Find the Lowest Common Ancestor (LCA) of two nodes in a binary tree.
Traverse the binary tree to find the paths from the root to nodes X and Y.
Compare the paths to find the last common node, which is the LCA.
Handle cases where one node is an ancestor of the other.
Consider edge cases like when X or Y is the root node.
Implement a recursive or iterative solution to find the LCA efficiently.
- Q2.
Rotated Array Minimum Finder
You are provided with a sorted array that has undergone 'K' rotations (the exact value of 'K' is unknown). A rotation involves shifting each element of the array to the right,...
- Ans.
Implement a function to find the minimum number in a rotated sorted array efficiently.
Use binary search to find the minimum element in the rotated array.
Compare the mid element with the start and end elements to determine which half of the array to search next.
Continue the binary search until the minimum element is found.
- Q3.
Maximum Binary Tree Construction Problem
Given an array
TREEof 'N' unique integers, construct a maximum binary tree using the following rules:- The root of this tree is the maximum number in
TREE. - T...
- The root of this tree is the maximum number in
- Ans.
Construct a maximum binary tree from an array of unique integers following specific rules.
Find the maximum number in the array to set as the root of the tree.
Recursively construct the left subtree with elements before the maximum number.
Recursively construct the right subtree with elements after the maximum number.
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
Software Developer Interview Questions & Answers
JPMorgan Chase & Co.
Anonymous
posted on 10 May 2015
Interview Questionnaire
11 Questions
- Q1. What is the difference between multi tasking, multi processing and multi programming operating systems with examples ?
- Ans.
Multi tasking, multi processing, and multi programming are different approaches to managing tasks in an operating system.
Multi tasking allows multiple tasks to run concurrently on a single processor.
Multi processing involves multiple processors running tasks simultaneously.
Multi programming allows multiple programs to be loaded into memory and executed concurrently.
Examples of multi tasking operating systems include Wi...
- Q2. Tell me about memory allocation (stack vs. heap)?
- Ans.
Memory allocation refers to the process of assigning memory to programs during runtime.
Stack allocation is done automatically and is limited in size.
Heap allocation is done manually and is larger in size.
Stack memory is used for local variables and function calls.
Heap memory is used for dynamic memory allocation.
Memory leaks can occur if heap memory is not properly managed.
- Q3. You have two threads one printing even numbers in order and other odd numbers. Design an algorithm so that it prints numbers in natural order?
- Ans.
Use a shared variable and synchronization mechanisms to ensure natural order printing of numbers.
Create two threads, one for printing even numbers and the other for printing odd numbers.
Use a shared variable to keep track of the current number to be printed.
Implement synchronization mechanisms like locks or semaphores to ensure only one thread can access the shared variable at a time.
Each thread should check if it is i...
- Q4. Print a matrix in spiral order?
- Ans.
Printing a matrix in spiral order
Start from the first element and print it
Move in a spiral order towards the center of the matrix
Repeat until all elements are printed
- Q5. Thread class and Runnable Interface?
- Ans.
Thread class and Runnable Interface are used for multithreading in Java.
Thread class is a predefined class in Java that provides methods to create and control threads.
Runnable interface is used to define a task that can be executed by a thread.
Thread class implements Runnable interface.
Thread class provides more control over threads than Runnable interface.
Example: Thread t = new Thread(new MyRunnable()); t.start();
Exa...
- Q6. What’s the difference between a Linked List and an ArrayList and give me an example of when to use which?
- Ans.
Linked List is a dynamic data structure while ArrayList is a static data structure.
Linked List is best for frequent insertion and deletion operations.
ArrayList is best for frequent access operations.
Linked List uses more memory than ArrayList.
ArrayList is faster than Linked List for accessing elements.
Use Linked List when you need to frequently add or remove elements from the list.
Use ArrayList when you need to frequen...
- Q7. Questions of OS concepts?
- Q8. A role play scenario was given. With a clear instruction on I don’t need to know the basis and the hypothetical assumption was presented. I was told that I was expected to respond to the given scenario, in...
- Q9. Why are you interested in a career in investment banking?
- Ans.
I am not interested in a career in investment banking.
I am more interested in a career in software development
I enjoy problem-solving and creating innovative solutions through coding
Investment banking does not align with my passion and skill set
- Q10. Why have you chosen to apply to J.P. Morgan?
- Ans.
I have chosen to apply to J.P. Morgan because of their reputation, global presence, and opportunities for growth.
J.P. Morgan has a strong reputation in the financial industry.
They have a global presence with offices in multiple countries.
The company offers various opportunities for career growth and development.
J.P. Morgan is known for its innovative technology solutions in the financial sector.
I am impressed by their ...
- Q11. Have you ever made a mistake? Tell us about it?
- Ans.
Yes, I have made a mistake in my previous project.
I underestimated the complexity of a task and ended up missing the deadline.
I failed to properly test a feature, resulting in a bug that affected user experience.
I accidentally deleted an important file without having a backup.
I misunderstood a requirement and implemented a feature incorrectly.
Interview Preparation Tips
Total Questions: 1
General Tips: Interview Process: Aptitude test, followed by 3 rounds of interview. Interview process was very good. Just be positive to clear the interview.
Check this link before appearing for interview with JP Morgan. It will help -----
Skills: Algorithm, Data structure, Stack
College Name: Na
Skills evaluated in this interview
Interview Questionnaire
1 Question
- Q1. Core java,multi threading and react
Interview Preparation Tips
I appeared for an interview before Dec 2020.
(2 Questions)
Round duration - 90 minutes
Round difficulty - Medium
- Q1.
Maximum Sum With Specific Difference Problem Statement
Given an array of integers and a number 'K', your task is to find the maximum possible sum of disjoint pairs of numbers where the absolute difference...
- Ans.
Find maximum sum of disjoint pairs with absolute difference less than K in an array.
Iterate through the array and sort it.
Find all possible disjoint pairs with absolute difference less than K.
Calculate the sum of these pairs to get the maximum sum.
- Q2.
Ninja And The Tree Problem Statement
Ninja, while learning Binary Search Trees (BST), accidentally swapped two nodes in her self-constructed BST. Your task is to help Ninja by correcting the BST so that a...
- Ans.
The task is to correct a Binary Search Tree by swapping two nodes in the tree.
Parse the input level order tree and construct the BST
Identify the two nodes that are swapped incorrectly
Swap the values of the incorrectly swapped nodes to correct the BST
Return the corrected BST in level order form
Interview Preparation Tips
Tip 1 : Solve Code chef long challenges
Tip 2 : Solve at least problem A, B,C of codeforces competition(help to solve problems in time limit).
Tip 3 : Having at least 1 good project is a plus point.
Tip 1 : Not more than 2 pages(1 page is good)
Tip 2 : Must know about each and every point in the resume.
Tip 3 : There should be no grammatical error in the resume.
Skills evaluated in this interview
Software Developer Interview Questions & Answers
JPMorgan Chase & Co.
Anonymous
posted on 16 Dec 2021
I applied via Recruitment Consultant and was interviewed in Jun 2021. There were 4 interview rounds.
Interview Questionnaire
2 Questions
- Q1. Basic react
- Q2. Basic javascript
Interview Preparation Tips
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