Scanner input = new Scanner(System.in);
while(true) {
    System.out.println("Price: ");
    try {
      price = input.nextDouble();
      break;
    } catch(InputMismatchException ioe) {
        System.out.println("*** Menu choice must be numeric!");
    }
    if(price <= 0.0) System.out.println("*** Price must be above zero!\n");
       else break;
}