How to make a Range for Scanner input inside a parameter

// Horspower must have a range from 200 to 700 hp and Weight must have a range from 1000 to 3000 pounds

System.out.print("\n Set horsepower (200 to 700 hp) and weight(1,000 to 3,000 pounds) (putting a    space between them) of Race car 1: ");

RaceCar racer1 = new RaceCar(scan.nextDouble(), scan.nextDouble() );

How would you add a range to this?

The original RaceCar() is:

public RaceCar(double hp, double wgt)
{
    horsepower = hp;
    weight = wgt;
}