Nagarro Software Development Engineer 1 Interview Questions and Answers

Data Structures and Algorithms HackerRank

Q1. Design a Shopping cart Find nearest palindrome number to a given number
Ans. 
Design a shopping cart and find nearest palindrome number to a given number.
• Design a class for the shopping cart with methods like add item, remove item, calculate total price, etc.

• Implement a function to find the nearest palindrome number to a given number.

• You can iterate from the given number and check if each number is a palindrome until you find the nearest one.
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Q1. Explain over all experience
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Q2. Asked question on Core and advance java topic
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Q1. Some advance topic of Java
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Q2. DSA
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Q1. Salary expectation
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Q2. Relocation
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Q1. What is inheritance
Ans. 
Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.
• Allows for code reusability by creating a new class based on an existing class

• Derived class (subclass) inherits properties and behaviors from a base class (superclass)

• Can have multiple levels of inheritance, creating a hierarchy of classes

• Example: Animal class can be a base class with Dog and Cat
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Q2. What is polymorphism
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Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.
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Q3. Write a code for string reverse
Ans. 
Code to reverse a string using array of characters
• Iterate through half of the string and swap characters from start and end

• Use a temporary variable to store the character being swapped

• Handle edge cases like empty string or single character string
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Q1. What is abstraction and how can we achieve it?
Ans. 
Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the outside world.
• Abstraction allows us to focus on what an object does rather than how it does it

• Achieved through abstract classes and interfaces in object-oriented programming

• Example: A car dashboard abstracts the internal workings of the car and provides only essential information to the driver
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Q2. Difference between hashtable and hashmap
Ans. 
Hashtable is synchronized, while hashmap is not. Hashtable does not allow null keys or values, while hashmap does.
• Hashtable is synchronized, while hashmap is not

• Hashtable does not allow null keys or values, while hashmap does

• Hashtable is a legacy class, while hashmap is a newer class
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Q3. How get() works insterally in hashmap
Ans. 
The get() method in HashMap retrieves the value associated with a specified key.
• get() method takes a key as input and returns the value associated with that key in the HashMap.

• Internally, get() uses the hash code of the key to find the corresponding bucket in the HashMap.

• If multiple keys have the same hash code, get() uses the equals() method to find the correct key-value pair.
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Q4. What is normalization?
Ans. 
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
• Normalization helps in minimizing data redundancy by dividing the database into multiple tables and defining relationships between them.

• It ensures data integrity by avoiding update anomalies and inconsistencies.

• There are different normal forms such as 1NF, 2NF, 3NF, BCNF, and 4NF, each with specific rules to fo...read more
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Q5. What are constraints?
Ans. 
Constraints are limitations or restrictions placed on a system or process.
• Constraints define the boundaries within which a system must operate.

• They can include limitations on resources, time, or functionality.

• Examples of constraints in software engineering include memory limitations, processing speed, and input/output requirements.
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Q6. Write a query to get 3rd highest salary from the employee table
Ans. 
Query to retrieve the 3rd highest salary from the employee table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to retrieve the 3rd highest salary
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Q7. Write a code to get 2nd last node and its value from the singly linked list.
Ans. 
Traverse the linked list to find the 2nd last node and return its value.
• Traverse the linked list while keeping track of the current and previous nodes.

• Once at the end of the list, return the value of the previous node.
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Q8. You have an array of integer and retrieve the 2 smallest number from it without sorting the array.
Ans. 
Use two variables to keep track of the smallest and second smallest numbers in the array.
• Iterate through the array and update the variables accordingly.

• Initialize the variables with the maximum possible integer value to start with.

• Example: array = [5, 2, 8, 1, 3], smallest = 1, secondSmallest = 2.
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Q1. Cloud computing related questions
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Q2. Network topology
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Q1. What is Procedure and package
Ans. 
Procedure and package are two types of database objects used in Oracle database.
• A procedure is a subprogram that performs a specific action and can be called by other programs.

• A package is a collection of related procedures, functions, and variables that can be used by multiple programs.

• Procedures and packages are stored in the database and can be called from any program that has access to the database.

• Procedures and p...read more
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Q2. View and materilzed view differences
Ans. 
View is a virtual table while Materialized view is a physical table.
• View is a logical representation of data while Materialized view is a physical copy of data.

• View is updated dynamically while Materialized view needs to be refreshed manually.

• Materialized view is faster for read-heavy operations while View is better for write-heavy operations.

• Materialized view can be indexed while View cannot be indexed.
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Q1. Database types and standards
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OOPS AND DSA QUESTION

Q1. Hiring manager round
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