Certainly! Below are the Java programs for the tasks you've requested:

1. Program to Check if a Number is Armstrong Number:

import java.util.Scanner;

public class ArmstrongNumber {
    public static void main(String[] args) {
        int num, originalNum, remainder, result = 0;

        Scanner sc = new Scanner(System.in);
 System.out.print("Enter a number: ");
        num = sc.nextInt();
        originalNum = num;

        while (originalNum != 0) {
            remainder = originalNum % 10;
            result += Math.pow(remainder, 3);
            originalNum /= 10;
        }

        if (result == num) {
            System.out.println(num + " is an Armstrong number.");
        } else {
            System.out.println(num + " is not an Armstrong number.");
        }
    }
}

2. Program Generate Fibonacci Series:

import java.util.Scanner;

public class FibonacciSeries {
    public static void main(String[] args) {
        n, firstTerm = 0, secondTerm = 1;
        
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the number of terms: ");
        n = sc.nextInt();

        System.out.println("Fibonacci Series:");
        for (int i = 1; i <= n; i++) {
            System.out.print(firstTerm + "  ");
            int nextTerm = firstTerm + secondTerm;
            firstTerm = secondTerm;
            secondTerm nextTerm;
        }
    }
}

3. Program to Convert Binary to Octal:

import java.util.Scanner;

public class BinaryToOctal {
    public static void main(String[] args) {
        long binaryNumber, octalNumber = 0, decimalNumber = 0, i = 0;
        
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a binary number: ");
        binaryNumber = sc.nextLong();

        while (binaryNumber != 0) {
            decimalNumber += (binaryNumber % 10) * Math.pow(2, i);
            ++i;
            binaryNumber /= 10;
        }

        i = 1;
        while (decimalNumber != 0) {
            octalNumber += (decimalNumber % 8) * i;
            decimalNumber /= 8;
            i *= 10;
        }

        System.out.println("Octal equivalent: " + octalNumber);
    }
}

You can compile and run these programs in a Java development environment or IDE. If you have any questions or need further assistance, feel free to ask!

In Java, the multi-catch block allows you to catch multiple exceptions in a single catch block. This feature was introduced in Java 7 to simplify exception handling code. It improves code readability and reduces redundancy when handling multiple exceptions. Here's the syntax and an example of using multi-catch block:

Syntax:

try {
    // Code that may throw exceptions
} catch (ExceptionType1 | ExceptionType2 | ... | ExceptionTypeN e) {
    // Exception handling code
}

Example:

try {
    // Code that may throw exceptions
    FileReader file = new FileReader("file.txt");
    BufferedReader fileReader = new BufferedReader(file);
    // Reading file content
} catch (FileNotFoundException | IOException e) {
    System.out.println("An error occurred: " + e.getMessage());
    // Additional exception handling code
} finally {
    // Code to close resources or perform cleanup
}

In the example above:

• The try block contains the code that may throw exceptions, such as file handling operations.
• The catch block uses the multi-catch syntax, where | the exception types that are being caught. This means that the catch block can catch either FileNotFoundException or IOException or both types of exceptions.
• Inside the catch block, you can handle the exceptions as needed, as logging the error, displaying a message to the user, or taking appropriate corrective actions.
• The finally block can be used to place code that must be executed regardless of whether an exception is thrown.

Using multi-catch blocks can make exception handling more concise and readable, especially when the same handling logic is applicable to multiple exception types.

Certainly! Below is a step-by-step procedure for installing the LAMP stack (Apache, MySQL, and PHP) on a Linux system, specifically using Ubuntu as an example:

Step 1: Update System Packages

sudo apt update
sudo apt upgrade

Step 2: Install Apache

sudo apt install apache2

After installation, Apache should start automatically. You can test the installation by entering your server's IP address or hostname in a web browser. You should see the Apache default page if the installation is successful.

Step 3: Install MySQL

sudo apt install mysql-server

During the installation, you will be prompted to set a root password for MySQL. Once installed, you can secure the installation by running:

sudo mysql_secure_installation

Step 4: Install PHP and Modules

sudo apt install php libapache2-mod-php php-mysql

Step 5: Configure Apache to Use PHP

sudo nano /etc/apache2/mods-enabled/dir.conf

In the configuration file, move the PHP index file (index.php) to the first position.

<IfModule mod_dir.c>
    DirectoryIndex index.php index.html index.cgi index.pl index.xhtml index.htm
</IfModule>

Step 6: Restart Apache for Changes to Take Effect

sudo systemctl restart apache2

Step 7: Test PHP Processing Create a test PHP file in the document root directory. For example:

sudo nano /var/www/html/info.php

Add the following line to the file:

<?php phpinfo(); ?>

Save and close the file, then access this file in a web browser using your server's IP address or hostname (e.g., http://your_server_ip/info.php). You should see the PHP information page if the installation is successful.

You have now successfully installed the LAMP stack on your Linux system. You can now proceed to configure your web applications and databases as needed.