Practice problems

import java.util.Scanner;
public class VotingEligibilityChecker {

    // Method to check if a person is eligible to vote
    boolean isEligibleToVote(int age) {
        return age >= 18;
    }

    public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
        System.out.println("Enter your age:");
		int personAge = input.nextInt();
		VotingEligibilityChecker obj = new VotingEligibilityChecker();
		boolean result = obj.isEligibleToVote(personAge);

        // Check eligibility and print the result
        if (result == true) {
            System.out.println("You are eligible to vote!");
        } else {
            System.out.println("Sorry, you are not eligible to vote yet.");
        }
    }
}

import java.util.Scanner;

class Main {
 
    // The method checks if a number is even (true) or odd (false).
    boolean checkParity(int number) {
        if (number % 2 == 0) {
            return true;
        } else {
            return false;
        }
    }
 
    public static void main(String[] args) {
 
        Scanner input = new Scanner(System.in);
        Main obj = new Main();
 
        System.out.println("Enter a number:");
        int n = input.nextInt();
 
        // The result will be either true (even) or false (odd).
        boolean result = obj.checkParity(n);
 
        // Prints if the result is true (even) or false (odd).
        if (result) {
            System.out.println(n + " is even.");
        } else {
            System.out.println(n + " is odd.");
        }
    }
}

import java.util.Scanner;

public class FactorialCalculator {

    // Method to compute the factorial
    int computeFactorial(int n) {
        // Initialize factorial to 1
        int factorial = 1;

        // Compute factorial using a loop
        for (int i = 1; i <= n; i++) {
            factorial *= i;
        }

        // Return the computed factorial
        return factorial;
    }

    public static void main(String[] args) {
        FactorialCalculator obj = new FactorialCalculator();
      
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter a non-negative number:");
        int number = scanner.nextInt();

        // Call computeFactorial method and store the result in total
        int total = obj.computeFactorial(number);

        // Print the result
        System.out.println("The factorial of " + number + " is: " + total);
    }
}

class Main {

    // Method to determine and return the maximum of three numbers
    int findMaximum(int num1, int num2, int num3) {

        int maximum = num1; // Assume num1 is the maximum initially

        if (num2 > maximum) {
            maximum = num2; // Update maximum if num2 is greater
        }

        if (num3 > maximum) {
            maximum = num3; // Update maximum if num3 is greater
        }

        return maximum; // Return the final maximum value
    }

    public static void main(String[] args) {

        // Create an instance of the Main class
        Main obj = new Main();

        // Find and print the maximum among three numbers
        int result = obj.findMaximum(3, 55, 10);
        System.out.println("The maximum number is: " + result);  // Output: 55

        result = obj.findMaximum(0, 12, 30);
        System.out.println("The maximum number is: " + result);  // Output: 30
    }
}