Java Primitives Notebook

import java.util.Scanner;

public class Primitives {
    public static void main(String[] args) {
        Scanner input;
        double fahrenheit = 0.0;
        double celsius = 0.0;
        boolean correctDouble;

        input = new Scanner(System.in);
        System.out.print("Enter a temperature in Fahrenheit: ");
        try {
            fahrenheit = input.nextDouble();
            System.out.println(fahrenheit);
            correctDouble = true;
        } catch (Exception e) {
            correctDouble = false;
        }
        input.close();

        celsius  = ((fahrenheit-32)*5)/9; 

        System.out.println( fahrenheit + " °F is = " + celsius + " °C"); 
    }
}
Primitives.main(null);

Enter a temperature in Fahrenheit: 0.0 °F is = -17.77777777777778 °C