10+ Interview Questions and Answers

Interview questions for Software Engineer position

• Inheritance is used to create a new class from an existing class, to reuse code and add new functionality

• Fail-safe iterators continue iterating even if there is a concurrent modification, while fail-fast iterators throw a ConcurrentModificationException

• Linked lists are used in applications like music playlists, stacks are used in undo/redo functionality, and queues are used in job scheduling

• To reverse a linked list using recur...read more

Swapping two integer values without using a third variable.

• Use XOR operator to swap two integers without using a third variable.

• Addition and subtraction can also be used to swap two integers.

• Bitwise operations can also be used to swap two integers.

Yes, I am willing to relocate for the right opportunity.

• I am open to exploring new locations and cultures.

• I understand that relocation may be necessary for career growth.

• I am willing to consider factors such as cost of living and job market in the new location.

• I am excited about the prospect of new challenges and experiences.

I have worked on multiple programming languages including Java, Python, C++, and JavaScript.

• Proficient in Java and Python for backend development

• Experience in C++ for competitive programming and algorithm development

• Familiarity with JavaScript for frontend development and web applications

Abstract class can have implementation while interface only has method signatures.

• Abstract class can have constructors while interface cannot.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract class can have non-public members while interface only has public members.

• Abstract class is used for creating a base class while interface is used for implementing a contract.

• Example of abstract class: Animal with abstract method 'makeSound'....read more

Yes, I have knowledge about databases.

• I am familiar with relational databases like MySQL, PostgreSQL, and Oracle.

• I have experience with NoSQL databases such as MongoDB and Cassandra.

• I understand database design principles, normalization, and indexing.

• I have worked with SQL queries, stored procedures, and triggers.

• I am proficient in database management and optimization.

Swapping two numbers without using a third variable in code

• Use bitwise XOR operation to swap two numbers without using a third variable

• Example: a = 5, b = 7; a = a ^ b; b = a ^ b; a = a ^ b; // Now a = 7, b = 5

Overriding Equals method helps to compare objects based on their values rather than their references.

• Default implementation of Equals method compares object references

• Overriding Equals method allows custom comparison based on object values

• Helps in implementing value equality for custom classes

• Used in collections like HashSet to check for duplicates

Object-Oriented Programming concepts include encapsulation, inheritance, and polymorphism.

• Encapsulation: bundling data and methods that operate on that data within a single unit (class). Example: private variables in a class.

• Inheritance: creating new classes from existing ones, inheriting their properties and methods. Example: a subclass of a vehicle class inheriting its speed and fuel capacity.

• Polymorphism: the ability of objects to take on different forms or behaviors. Exam...read more

Programming language is a set of instructions used to communicate with computers and create software.

• Programming languages are used to write code for software applications, websites, and other computer programs.

• Examples of programming languages include Java, Python, C++, and JavaScript.

• Each programming language has its own syntax and rules for writing code.

• Programming languages can be classified as high-level or low-level, depending on their level of abstraction.

• Learning a pr...read more

Program to reverse a given string

• Use a loop to iterate through the characters of the string

• Swap characters from start and end of the string until reaching the middle

• Return the reversed string

OOPs is a programming paradigm based on the concept of objects, which can contain data and code to manipulate that data. Memory management involves allocating and deallocating memory for objects.

• OOPs stands for Object-Oriented Programming, where objects are instances of classes that encapsulate data and behavior.

• In OOPs, concepts like inheritance, polymorphism, and encapsulation are used to organize and structure code.

• Memory management involves allocating memory for objects w...read more

Primary key is a unique identifier for a record in a database table.

• Primary key ensures data integrity and helps in faster data retrieval.

• It cannot have null values and must be unique for each record.

• Examples of primary keys are social security number, email address, etc.

CLR stands for Common Language Runtime, it is the virtual machine component of Microsoft's .NET framework.

• CLR is responsible for managing the execution of .NET programs.

• It provides services such as memory management, exception handling, and security.

• CLR compiles the intermediate language code into native code using Just-In-Time (JIT) compilation.

• It allows different languages to be used within the .NET framework, as long as they are supported by the CLR.

• Examples of languages t...read more

Managed code is code that is executed by the Common Language Runtime (CLR) while unmanaged code is executed directly by the operating system.

• Managed code is written in high-level languages like C#, VB.NET, and runs in a managed environment like .NET framework.

• Unmanaged code is written in languages like C, C++, and directly interacts with the operating system.

• Managed code provides automatic memory management, security, and exception handling, while unmanaged code requires manu...read more

Pseudo code for sorting an array of strings

• Initialize an empty array to store the sorted strings

• Iterate through the input array and compare each string with the others to determine the correct order

• Use a sorting algorithm like bubble sort, selection sort, or merge sort to rearrange the strings