1. **Sum of Two Numbers**: Write a program that prompts the user for two numbers and prints their sum. ```java import java.util.Scanner; public class SumNumbers { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter the first number: "); int num1 = scanner.nextInt(); System.out.print("Enter the second number: "); int num2 = scanner.nextInt(); int sum = num1 + num2; System.out.println("The sum is: " + sum); scanner.close(); } } ``` 2. **Factorial of a Number**: Write a program that calculates the factorial of a number given by the user. ```java import java.util.Scanner; public class Factorial { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a number to calculate the factorial: "); int number = scanner.nextInt(); int factorial = 1; for (int i = 1; i <= number; i++) { factorial *= i; } System.out.println("The factorial of " + number + " is: " + factorial); scanner.close(); } } ``` 3. **Prime Number Check**: Write a program that checks whether a number given by the user is prime or not. ```java import java.util.Scanner; public class PrimeNumber { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a number to check if it is prime: "); int number = scanner.nextInt(); boolean prime = true; for (int i = 2; i <= number / 2; i++) { if (number % i == 0) { prime = false; break; } } if (prime) System.out.println(number + " is a prime number."); else System.out.println(number + " is not a prime number."); scanner.close(); } } ``` Feel free to use these exercises for practice. And let me know in the comments what you think. :-)