Interview Questions and Answers

The questions cover topics like operating systems, file compression, primary keys, JVM, and network types.

• The latest versions of Windows are Windows 10 and Windows Server 2019.

• ZIP is a file compression format used to reduce file size and bundle multiple files together.

• Unzip is the process of extracting files from a ZIP archive.

• A primary key is a unique identifier for a database record. It cannot be null.

• A primary key can have a value of zero if it is an auto-incrementing fiel...read more

Java is a popular programming language known for its platform independence and object-oriented features. It does not support pointers to ensure memory safety and prevent direct memory manipulation.

• Java uses references instead of pointers to access objects, which provides a level of abstraction and simplifies memory management.

• Pointers in languages like C and C++ can lead to memory leaks, segmentation faults, and other low-level programming errors.

• By not supporting pointers, J...read more

In a daily environment, a Server Administrator is responsible for managing and maintaining servers to ensure they are running efficiently and securely.

• Regularly monitor server performance and troubleshoot any issues that arise

• Implement security measures to protect servers from cyber threats

• Update software and firmware to ensure servers are running on the latest versions

• Backup data regularly to prevent data loss in case of server failure

Object-oriented programming paradigm that focuses on objects and classes for code organization and reusability.

• Encapsulation: bundling data and methods that operate on the data into a single unit (object)

• Inheritance: ability of a class to inherit properties and behavior from another class

• Polymorphism: ability to present the same interface for different data types

Normalization is the process of organizing data in a database to eliminate redundancy and improve data integrity.

• Normalization helps in reducing data redundancy by breaking down a large table into smaller, more manageable tables.

• It ensures that each piece of data is stored only once, reducing storage space and improving efficiency.

• Normalization also helps in maintaining data integrity by preventing anomalies like update, insert, and delete anomalies.

• There are different levels...read more

A server is a computer or software program that provides functionality for other programs or devices.

• A server is a computer or software program that serves requests from clients.

• Servers can provide various services such as file storage, email, web hosting, and database management.

• Examples of servers include web servers like Apache or Nginx, email servers like Microsoft Exchange, and file servers like Windows Server.

Polymorphism is the ability of an object to take on many forms. It allows objects of different classes to be treated as the same type.

• Polymorphism is a fundamental concept in object-oriented programming.

• It allows a single interface to be used for different types of objects.

• Polymorphism can be achieved through method overriding and method overloading.

• Example: A shape class with different subclasses like circle, square, and triangle can be treated as a shape object.

String pool is a memory area in Java where strings are stored to optimize memory usage. OOPS stands for Object-Oriented Programming System. HashMap is a data structure in Java that stores key-value pairs.

• String pool in Java is a special memory area where strings are stored to optimize memory usage.

• OOPS stands for Object-Oriented Programming System, a programming paradigm based on the concept of objects.

• HashMap is a data structure in Java that stores key-value pairs and uses h...read more