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1. What is SQL? Answer:SQL (Structured Query Language) is a standard programming language used for managing and manipulating relational databases. It allows users to perform operations such as creating tables, inserting data, updating records, retrieving data, and deleting records. SQL is used by database systems like MySQL, PostgreSQL, SQL Server and Oracle. Example:To retrieve all … Read more
1. What is the C programming language? Answer:C is a high-level, general-purpose programming language developed by Dennis Ritchie in 1972 at Bell Labs. It is widely used for system programming, developing operating systems, embedded systems and applications due to its efficiency and control over hardware.Example: #include <stdio.h>int main() { printf(“Hello, World!”); return 0;} This program … Read more
1. What is Cyber Security? Answer:Cyber Security is the practice of protecting computer systems, networks, and data from cyberattacks, unauthorized access, or damage. It involves various techniques like encryption, firewalls and secure protocols to safeguard sensitive information.For example, using HTTPS instead of HTTP secures the communication between a user and a website. 2. What are … Read more
1. What is PHP? Answer:PHP (Hypertext Preprocessor) is an open-source server-side scripting language used to create dynamic and interactive web pages. It is embedded within HTML and is widely used for developing web applications. Example: <?phpecho “Hello, World!”;?> 2. What are the features of PHP? Answer:PHP provides features such as: 3. What is the difference … Read more
What is Sorting? Sorting means arranging data in a specific, meaningful order, usually ascending (small to large) or descending (large to small). It is one of the most important concepts in computer science because it helps in organizing, searching, and analyzing data efficiently. For example, when you open your phone’s contact list, names appear alphabetically, … Read more
What is a Lambda Expression? A Lambda Expression is a short and clean way to represent a block of code that can be passed around and executed later. It was introduced in Java 8 to make programming easier and more expressive, especially when working with functional interfaces Before lambda expressions, if you wanted to implement … Read more
What is Java Threads? In Java, a thread is the smallest part of a program that can run independently. It is called a lightweight subprocess because it runs inside a larger program but performs its own task at the same time. Threads make it possible for Java applications to handle multiple activities at once, for … Read more
In Java, Regular Expressions (RegEx) are a powerful tool to find and manage patterns in text. They help you search, check, or modify strings quickly and efficiently. Java provides built-in support for Regular Expressions through the java.util.regex package. What is a Regular Expression? A Regular Expression (RegEx) is a sequence of characters that represents a … Read more
What is an Exception? An exception is an event that happens during the execution of a program, which interrupts its normal flow. Rather than allowing the entire program to crash, Java gives developers a structured way to detect, report, and handle these problems gracefully. An exception in Java is actually an object that is created … Read more
What is a Wrapper Classes? In Java, Wrapper Classes are special classes that convert primitive data types (such as int, char, and Boolean) into objects. They are called wrapper classes because they literally “wrap” the primitive value inside an object, giving it extra abilities that a normal primitive variable doesn’t have. Java provides a separate … Read more