OATIndia Software Developer Interview Questions and Answers

Arrays and strings - 90 mins

Create Modules, railway reservation system - 60 mins

Q1. Difference between hashmap and hasptable
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Q2. Why typescript over javascript
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Q3. Find the percentage of increace in the quantity of item after making it price 20% extra
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Q4. What is normalization
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Q5. Date and time api available
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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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It was an amazing interview.

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Basic DSA from the hacker rank website

Q1. Basic to medium questions on javascript, nodejs, MySQL joints, html5 tags
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Q1. Real life problems, Use cases
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Q1. Features of new Java versions?
Ans. 
New Java versions introduce various features and improvements for developers.
• Java 8 introduced lambda expressions and the Stream API for functional programming.

• Java 9 added the module system to improve code organization and security.

• Java 10 included local variable type inference for cleaner code.

• Java 11 introduced the HttpClient API for easier HTTP communication.

• Java 12 added switch expressions for more concise code.

• Ja...read more
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Q2. Hash map, hashing and internal working of collision handling
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Q1. Lru cache and its implementation in java
Ans. 
LRU cache is a data structure that stores the most recently used items, discarding the least recently used items when full.
• Use a LinkedHashMap to implement LRU cache in Java

• Override removeEldestEntry method to limit the size of the cache

• Accessing an element updates its position in the cache
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Q2. In depth discussion on basic of java
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Q1. Why sap and what if we offer less compensation
Ans. 
I chose SAP because of its industry-leading reputation and comprehensive suite of solutions. If offered less compensation, I would consider the overall growth opportunities and work-life balance.
• SAP is a widely used enterprise software with a strong market presence

• SAP offers a wide range of solutions for various industries, providing valuable experience and skill development

• Consider the overall growth opportunities, wo...read more
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Q2. About current project and ways you would make it better
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Q1. Implement stack using other data structures
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Implement stack using array or linked list
• Use an array or linked list to store elements in the stack

• Implement push() and pop() functions to add and remove elements from the stack

• Maintain a pointer to keep track of the top element in the stack
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Q2. Current project and what technology you are using
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Q1. What motivates you to join sap
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I am motivated to join SAP because of their reputation for innovation, global impact, and opportunities for growth.
• SAP is a global leader in enterprise software solutions, offering cutting-edge technology and opportunities to work on impactful projects.

• I am excited about the chance to work with a diverse team of talented individuals and learn from industry experts.

• SAP's commitment to innovation and continuous learning ...read more
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Q2. What is your top priority while choosing new job
Ans. 
My top priority while choosing a new job is growth opportunities and a positive work culture.
• Opportunities for career advancement and skill development

• Positive work environment and company culture

• Alignment with personal values and goals

• Competitive compensation and benefits

• Work-life balance
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LeetCode , hard questions on dynamic programming, graphs, and more.

DSA, Cn, os, DBMS, ML

Q1. Is relocation a possibility for this position?
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Q2. Senior role is there
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Q1. What are the key concepts of Object-Oriented Programming (OOP)?
Ans. 
Key concepts of OOP include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Allowing a class to inherit properties and behavior from another class.

• Polymorphism: Objects of different classes can be treated as objects of a common superclass.

• Abstraction: Hiding complex implementation details and showing onl
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Q2. What is the internal working mechanism of a HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple keys hash to the same index (collision), a linked list is used to store these pairs.

• To retrieve a value, t...read more
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Q1. Bubble sort and array was given
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Q2. Create binary tree
Ans. 
A binary tree is a data structure where each node has at most two children.
• Start by creating a Node class with left and right child pointers.

• Implement methods to insert, search, and delete nodes in the tree.

• Consider different traversal methods like inorder, preorder, and postorder.
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Q3. HightBuilding Pattern
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