4 Aug 2024
12 Feb 2024
JAVA PROGRAM - ADDITION OF TWO MATRICES
## Write a Java Program to ADD TWO MATRICES
|
public class MatrixAddition {
public static void main(String[]
args) {
int[][] firstMatrix = { {1, 2, 3},
{4, 5, 6}, {7, 8, 9} };
int[][] secondMatrix = { {9, 8, 7},
{6, 5, 4}, {3, 2, 1} };
// Creating a matrix to store the
result
int[][] result = new
int[firstMatrix.length][firstMatrix[0].length];
// Adding corresponding elements of
two matrices
for (int i = 0; i <
firstMatrix.length; i++) {
for (int j = 0; j <
firstMatrix[i].length; j++) {
result[i][j] = firstMatrix[i][j] +
secondMatrix[i][j];
}
}
// Displaying the result matrix
System.out.println("Result of Matrix
Addition:");
for (int i = 0; i < result.length;
i++) {
for (int j = 0; j <
result[i].length; j++) {
System.out.print(result[i][j] + "
");
}
System.out.println();
}
}
}
|
NODE JS PROGRAM - PRINT NUMBERS FROM 1 TO 10
## Write a Node Js program to print numbers from 1 to 10
// Define the upper limit for the loop const limit = 10; // Print numbers from 1 to the limit using a for-loop console.log("Printing numbers using a for loop:"); for (let i = 1; i <= limit; i++) { console.log(i); } |
11 Feb 2024
NODE JS PROGRAM - FACTORIAL OF A NUMBER
## Write a Node Js program to print the Factorial of a number
|
function factorial(n) {
if (n === 0 || n === 1) {
return
1;
}
else {
return n *
factorial(n - 1);
}
}
const number = 10;
// Change this to calculate the factorial of a different number
const result = factorial(number); // Function
calling
console.log(`Factorial of ${number} is: ${result}`);
|
NODE JS PROGRAM - PRINT EACH NUMBER OF AN ARRAY USING LOOP
## Write a Node Js program to iterate over an array and print each number
|
const arrNumber = [1,2,3,4,5];
console.log ( "Printing numbers using a FOR Loop: ");
for (let i = 0 ; i < arrNumber.length ; i++) { console.log (arrNumber[i]);
}
|
JAVA TUTORIAL PART 3 - DATA TYPES AND COMMENTS
Data Types in Java
1) Primitive Data Types
- These are the most basic data types in Java. They represent single values and are not objects.
There are different primitive data types -
There are different primitive data types -
a) Integer Types-
- byte - 8-bit signed integer. Range varies from -128 to 127
- short - 16-bit signed integer. Range varies from -32,768 to 32,767
- int - 32-bit signed integer. Range varies from -2^31 to 2^31-1
Example - int num = 10;
- long- 64-bit signed integer. Range varies from -2^63 to 2^63-1
b) Floating-Point types:
- float - 32-bit floating-point number. It should be suffixed with 'f' or 'F'
- double - 64-bit floating-point number.
Example - double pi = 3.14;
c) Other Primitive types:
- char - 16-bit Unicode character.
Example - char letter = 'H';
- boolean - Represents the two values - true and false
Example - boolean flag = true;
2) Reference Data Types
- These are used to refer to objects. They do not store the actual data but store the reference (Memory Address) of the object.
There are different reference data types -
a) Class types-
- String - Represent a sequence of characters.
Example - String text = "Hello";
b) Array types-
- Arrays - Ordered collection of elements of the same type.
c) Interface types-
- Interfaces - Defines a set of methods that a class must implement.
Comments in Java
Single-Line comments start with //
Multi-Line comments starts with /* and ends with */
Example-
// This is a single-line comment /* * This is a multi-line comment * This is the second multi-line comment. */ |
10 Feb 2024
JAVA TUTORIAL PART 2 - JDK (Java Development Kit) INSTALLATION
1) Download the JDK
1) Visit the official Oracle website or OpenJDK website to download the JDK installer for your operating system.
2) Make sure to download the version that matches your operating system (Windows, macOS, or Linux)
2) Run the Installer
1) Once the JDK is installed, choose the installation directory for the JDK.
2) Set the Environment Variables-
- JAVA_HOME (example - C:\Program Files\ Java\jdk-16)
Add the JDK's bin Folder to the PATH environment variable.
- PATH (example - %JAVA_HOME%\bin)
3) Verify the Installation
Open the terminal or Command Prompt to check the Java version.
Example - java -version
Click Here to Learn About Java Data Types
JAVA PROGRAM - RIGHT TRIANGLE STAR PATTERN
## Write a Java Program to print the Right Triangle Star Pattern
*
* *
* * *
* * * *
* * * * *
|
public class RightTriangleStarPattern { public static void main(String[] args) { int rows = 5; for (int i = 1; i <= rows; i++) { for (int j = 1; j <= i; j++) { System.out.print("* "); } System.out.println(); } } }
|
JAVA PROGRAM - INVERTED PYRAMID STAR PATTERN
## Write a Java Program to Print an INVERTED PYRAMID STAR PATTERN
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
* * * * *
* * *
*
public class InvertedPyramidStarPattern { public static void main(String[] args) { int rows = 5; for (int i = rows; i >= 1; i--) { for (int j = 1; j <= rows - i; j++) { System.out.print(" "); } for (int k = 1; k <= 2 * i - 1; k++) { System.out.print("* "); } System.out.println(); } } }
|
JAVA PROGRAM - PYRAMID STAR PATTERN
## Write a Java program to print the PYRAMID STAR PATTERN?
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
public class PyramidStarPattern {
public static void main(String[] args) {
int rows = 5;
for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("* ");
}
System.out.println();
}
}
}
JAVA PROGRAM - LEAP YEAR OR NOT
## Write a Java Program to check if the year is LEAP YEAR or NOT
public class CheckLeapYear { public static void main(String[] args) { int year = 2024; if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) { System.out.println("The year " + year + " is a leap year."); } else { System.out.println("The year " year + " is not a leap year."); } } } |
JAVA PROGRAM - LARGEST VALUE AMONG THREE NUMBERS
## Write a Java program to find the largest value among three variables
public class LargestAmongThreeNumbers { public static void main(String[] args) { int num1 = 20; int num2 = 50; int num3 = 55; int largest = num1; if (num2 > largest) { largest = num2; } if (num3 > largest) { largest = num3; } System.out.println("The largest number among " + num1 + ", " + num2 + ", and " + num3 + " is: " + largest); } } |
JAVA PROGRAM - LARGEST VALUE AMONG TWO NUMBERS
## Write a Java Program to find the largest value among two numbers
public class LargestOfTwoNumbers { public static void main(String[] args) { int num1 = 10; int num2 = 20; if (num1 > num2) { System.out.println("The largest number is: " + num1); } else { System.out.println("The largest number is: " + num2); } } } |
8 Feb 2024
JAVA TUTORIAL PART 1 - INTRODUCTION TO JAVA
1) WHAT IS JAVA?
1) Java is a multi-platform, high-level, object-oriented programming language developed by Sun Microsystems (now owned by Oracle Corporation).
2) It is a fast, secure, reliable programming language for coding.
2) The main principle of Java is - "WRITE ONCE, RUN ANYWHERE"
3) Java programs can be compiled into Bytecode, which can then be executed on any platform that has a Java Virtual Machine (JVM).
4) Due to the ByteCode, there is no need to recompile the code for each platform.
2) Key Features of Java
1) Platform Independence - Java programs can run on any platform that has a JVM, making them very highly profitable.
2) Object-Oriented - Java is an OO language and hence it emphasizes the use of Classes and Objects for better code organization.
3) Simple and Familiar Syntax - It is similar to C and C++.
4) Memory Management - Java has a built-in garbage collector that manages memory allocation and deallocation automatically.
5) Robust and Secure - Java's strong type system, exception handling, and security features make it robust and secure.
6) Multithreading - Java supports multithreading to perform concurrent tasks easily.
3) Common Applications of Java
1) Web Development
2) Mobile Development
3) Desktop Applications
4) Enterprise Applications
5) Embedded Systems
4) Download Java
Download Java from the official website - https://www.oracle.com/java/technologies/downloads/
JAVA - SUBTRACT TWO NUMBERS
Write a JAVA program to subtract two numbers?
public class SubtractTwoNumbers { public static void main(String[] args) { int num1 = 10; int num2 = 5; int difference = num1 - num2; System.out.println("Difference of " + num1 + " and " + num2 + " is: " + difference); } } |
7 Feb 2024
JAVA - ADD TWO NUMBERS
## Write a Java program to add two numbers
public class AddTwoNumbers { public static void main(String[] args) { int num1 = 5; int num2 = 10; int sum = num1 + num2; System.out.println("Sum of " + num1 + " and " + num2 + " is: " + sum); } } |
NODE JS - ASYNCHRONOUS PROGRAMMING
1) What is Asynchronous Programming?
Asynchronous programming allows tasks to be executed concurrently without blocking the execution of other tasks and this can be achieved through callbacks, promises, and async/await.
Note that JavaScript is single-threaded. It carries out asynchronous operations via the callback queue and event loop.
2) Benefits of Asynchronous Programming?
1) Improved Performance - By avoiding blocking operations, asynchronous programming allows the application to continue executing other tasks while waiting for I/O operations to complete.
(Faster response times and better resource utilization).
2) Scalability - Asynchronous programming enables Node.Js applications to handle many concurrent requests without significant performance degradation.
(High-Performance web servers and real-time applications)
3) Responsive User Interfaces - Asynchronous programming ensures the user interface remains responsive even when performing time-consuming operations.
(Enhances the overall user experience and prevents applications from freezing)
3) Callbacks
Callbacks are a fundamental mechanism in Node Js for handling asynchronous operations.
Callbacks are functions passed as arguments to other functions and they are called once the operation is completed.
Example -
const fs = require('fs'); fs.readFile('example.txt', 'utf8', (err, data) => { if (err) { console.error(err); return; } console.log(data); }); |
4) Promises
Promises represent a value that may be available now, in the future, or never.
They allow chaining of asynchronous operations and handling of errors more elegantly.
They allow chaining of asynchronous operations and handling of errors more elegantly.
Promises improve code readability and make error handling easier.
Example -
const fs = require('fs').promises; fs.readFile('example.txt', 'utf8'). then((data) => { console.log(data); }) .catch((err) => { console.error(err); }); |
5) Async/ Await
Async functions enable writing asynchronous code in a synchronous-like manner using the 'async' and 'await'.
'async' - define an asynchronous function and 'await' - waits for promises to resolve.
Example -
const fs = require('fs').promises; async function testingAsync() { try { const data = await fs.readFile('example.txt', 'utf8'); console.log(data); } catch (err) { console.error(err); } } testingAsync(); |
6 Feb 2024
NODE JS - NPM
1) What is NPM?
- Node Js npm (Node Package Manager) is a package manager for JavaScript, which is used for managing dependencies in Node.js applications.
- With npm, we can easily install, manage, and update packages (Libraries/ Modules) that you can use in your applications.
- With npm, we can easily install, manage, and update packages (Libraries/ Modules) that you can use in your applications.
- www.npmjs.com hosts thousands of packages to download and use
- To install a package using npm -
npm install package-name
This will download the package and add it to your node_modules directory, along with dependencies.
- Example -
To install Express, you can run the below command -
npm install express
or
npm i express
npm i express
- Always include the installed package in your package.json file by adding them to the dependencies section.
Subscribe to:
Comments (Atom)