In java Scanner.next()
===

    public class Calculator
    {
    
    	public static void main(String[] args)
    	{
    		boolean isValid = false;
    		Scanner myScanner = new Scanner(System.in);
    		String customerType = null;
    		System.out.print("Customer Type? (C/R) ");
    		customerType = myScanner.next();
    		while (isValid == false)
    		{
    			System.out.print("Enter Subtotal: ");
    
    			if (myScanner.hasNextDouble())
    			{
    				double sobTotal = myScanner.nextDouble();
    				isValid = true;
    			}
    			else
    			{
    				System.out
    						.println("Hay! Entry error please enter a valid number");
    			}
    			myScanner.nextLine();
    		}
    	}
    }

Hi, im new to java, as usual im trying out a few things in the Scanner Class.

is there a way to see the input of the scanner? 
Cuz i have a problem here with the code above as you'll see. this is the output of my console window after i entered wrong data. instead of numbers i entered KKK so can somebody explain me why i got this error message 2 times?   

    "this is the console" 
    Customer Type? (C/R) R
    Enter Subtotal: KKK
    Hay! Entry error please enter a valid number
    Enter Subtotal: Hay! Entry error please enter a valid number
    Enter Subtotal: 

