Oracle Financial Services Software Senior Software Engineer 2 Interview Questions and Answers

Q1. Java programming string, linked list
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Q2. Trees, threads, deadlocks, multithreading
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Q1. JAVA programming
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Q2. Unit tests for the written program
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Q1. Data Structures and Algorithms
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Q2. Unit tests in JAVA
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Unit tests in JAVA are used to test individual units or components of a software application.
• Unit tests are written to verify the behavior of a specific piece of code in isolation.

• They help ensure that each unit of code works correctly on its own.

• JUnit is a popular Java framework for writing and running unit tests.

• Mockito is often used in conjunction with JUnit for mocking dependencies in unit tests.
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Q1. Salary Negotiation
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Q2. About org policies
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Covers basic theory concepts and then a simple coding questions with basic Data Structures

Q1. Design an online real time document sharing tool
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An online real time document sharing tool for collaboration and communication
• Implement real-time editing and commenting features

• Allow multiple users to access and edit the document simultaneously

• Provide version control and history tracking

• Include user authentication and permission settings

• Support various file formats such as text, images, and videos
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DSA round. Sliding Window Problem

Q1. Program to max sum of sub array
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Program to find the maximum sum of a subarray within an array of integers.
• Use Kadane's algorithm to find the maximum sum subarray in linear time complexity.

• Initialize two variables maxEndingHere and maxSoFar to keep track of the current subarray sum and the maximum sum found so far.

• Iterate through the array and update the variables accordingly.

• Example: Input array [1, -3, 2, 1, -1] should return 3 (subarray [2, 1] has
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Q1. Basic question about oops concepts, design principals, dependency injection, sql, entity framework.
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Q1. Project structure, scenario based questions, why and where to implement pattern, why we use entity framework over ado etc.
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Q1. What is your family background?
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Q2. What are your salary expectations?
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Q3. Why are you looking for a change?
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Q4. Share details of your previous job.
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Q5. Why should we hire you?
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It was nice, it was nice, it was nice

Q1. It was nice, it was nice, it was nice
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Q2. It was nice it was nice it was nice
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Q3. It was really nice
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Q4. It was really great
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Q5. It was really awesome
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30min duration simple questions

Basic array 2 coding questions

Q1. Introduce yorself
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Q2. Explain about final year project
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Q3. Github link for project
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Q4. What is oops in java
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Q5. What is polymorphism explain with examples
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Q1. Find longest palindromic substring in a given string.
Ans. 
Use dynamic programming to find the longest palindromic substring in a given string.
• Iterate through the string and expand around each character to find palindromes.

• Store the length of the longest palindrome found so far.

• Return the substring based on the start and end indices of the longest palindrome.
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Q2. How to serialize and deserialise a tree
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To serialize and deserialize a tree, use a recursive approach to traverse the tree and store the data in a suitable format.
• Use pre-order traversal to serialize the tree by storing the node values in a list or string.

• For deserialization, reconstruct the tree by recursively building nodes from the serialized data.

• Consider using JSON or XML format for serialization to easily store and retrieve tree structure.
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Q3. Find if a given regex (containing ., * and lower case english chars) matches a given string.
Ans. 
Use regex library to match given regex with string.
• Use a regex library like re in Python to match the given regex with the string.

• Check if the regex matches the string using the library functions.

• Handle cases where the regex contains special characters like . and * appropriately.
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Q4. Explain about throttling and implement throttle function.
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Throttling is a technique used to control the rate of requests sent to a server.
• Throttling helps prevent server overload by limiting the number of requests processed at a time.

• Implementing a throttle function involves setting a maximum request rate and delaying excess requests.

• Example: Implementing a throttle function in a web application to limit the number of API calls made to a third-party service.

• Example: Throttlin...read more
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Q1. Find squares of elements in a sorted array and return the sorted response.
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Sort the squares of elements in a sorted array and return the sorted response.
• Iterate through the array and square each element.

• Store the squared values in a new array.

• Sort the new array and return it.
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Q2. Write a short promise example and implement your own promise
Ans. 
A promise is a commitment to do something in the future, typically used for asynchronous operations in JavaScript.
• Promises are used to handle asynchronous operations in JavaScript.

• They represent a value that may be available now, in the future, or never.

• Promises have three states: pending, fulfilled, or rejected.

• Example: new Promise((resolve, reject) => { setTimeout(() => resolve('Done!'), 1000); });
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Q3. Explain event loop, what are different types of queues in event loop
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Event loop is a mechanism that allows for asynchronous execution of code by managing the order of events in a single thread.
• Event loop continuously checks the call stack for any functions that need to be executed, and processes them in a non-blocking manner.

• Different types of queues in event loop include microtask queue (Promise callbacks), macrotask queue (setTimeout, setInterval callbacks), and animation frame queue
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Q4. What is virtual DOM and why its faster
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Virtual DOM is a lightweight copy of the actual DOM, used to improve performance by minimizing direct manipulation of the real DOM.
• Virtual DOM is a concept used in frameworks like React to optimize rendering performance.

• Changes are first made to the virtual DOM, which is then compared to the real DOM to identify the minimal updates needed.

• This approach reduces the number of actual DOM manipulations, resulting in faster...read more
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Q1. Angular structure
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Q2. Dependency injection
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Q1. Manageral questions
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Q2. Scenario based questions
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Q1. Package discussion
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