public class ParameterExample2 {
    public static void main(String[] args) {
        int x = 17;
        doubleNumber(x);
        System.out.println("x = " + x);
        System.out.println();
        
        int number = 42;
        doubleNumber(number);
        System.out.println("number = " + number);
    }
    
    public static void doubleNumber(int number) {
        System.out.println("Initial value = " + number);
        number *= 2;
        System.out.println("Final value = " + number);
    }
}