main.java

public class Main {  // Class name should start with an uppercase letter (Java convention)
    public static void main(String[] args) {
        int x = Integer.parseInt(args[0]); // Convert the first argument to an integer
        int y = Integer.parseInt(args[1]); // Convert the second argument to an integer
        String operation = args[2].toLowerCase(); // Convert the third argument (operation) to lowercase

        switch (operation) {
            case "add": 
                System.out.println("The sum of two numbers is " + (x + y));
                break;
            case "subtract":
                System.out.println("The sub of two numbers is " + (x - y));
                break;
            case "multiply":
                System.out.println("The mul of two numbers is " + (x * y));
                break;
            case "divide":
                if (y != 0) {
                    System.out.println("The div of two numbers is " + (x / y));
                } else {
                    System.out.println("Division by zero is not allowed.");
                }
                break;
            default:
                System.out.println("Invalid operation.");
                break;
        }
    }
}