1. What is an Array? An array is a collection of elements stored at contiguous memory locations. All elements in an array must be of the same data type. Arrays allow random access to elements, meaning you can access any element using its index. Example: int[] arr = {1, 2, 3, 4, 5};System.out.println(arr[2]); // Output: … Read more
1. What is Java? Java is a high-level, object-oriented programming language developed by Sun Microsystems in 1995. It is platform-independent, meaning that Java programs can run on any device that has the Java Runtime Environment (JRE) installed. This is achieved through the use of Java Virtual Machine (JVM), which allows Java applications to run on … Read more
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