package example6_2;

import java.util.Scanner;

public class HelpingHelper {
    // don't throw it, handle it!
    public static void main(String[] args) /* throws Exception */ {
        Scanner in = new Scanner(System.in);

        double usefulInfo = 0;
        while(usefulInfo <= 0) {
            try {
                usefulInfo = obtainDouble(in);
                System.out.println("DEBUG: succeeded with obtainDouble()");
            } catch (Exception e) {
                System.out.println("DEBUG: Handling exception");
            }
            System.out.println("DEBUG: end of loop");
        }
        System.out.println("DEBUG: finished handling");

        System.out.println("You entered: "+usefulInfo);
    }

    /**
     *
     * @param in
     * @return
     */
    private static double obtainDouble(Scanner in) throws Exception {
        System.out.println("Please enter a positive double: ");
        double result = in.nextDouble();
        if(result <= 0) {
            // System.out.println("I just can't take it any more!!");
            throw new Exception("User entered a negative number.");
        }

        return result;
    }
}