public static void main(...)
{
   Car racer = new Car(7);
   . . .
The Constructor
pWhen we declare a Car
pand activate the constructor, the computer makes a radio link with a car that has a particular number.
This example demonstrates the usage of the constructor. In this example, we have declared a Car called racer and the activated the constructor with the argument 7.

The argument 7 just indicates which of several cars we want to control.  Each car needs to have a unique number.  In this example, we are making a radio connection to "Car Number 7".  Any future radio signals generated by activating racer's methods will control "Car Number 7".