Using Dialog Box To Store And Return Minimum Value?

I have to return the minimum and maximum value entered by the user, so far the program returns the maximum but the minimum stays at 0. I assigned 0 to the min and max variables. I believe that is part of the problem, but why do I get an accurate answer on the max if both variables are assigned to 0?

int min = 0;
int max = 0;
int option = JOptionPane.YES_OPTION;
while ( option == JOptionPane.YES_OPTION){
String dataString = JOptionPane.showInputDialog("Enter an integer");
int data = Integer.parseInt(dataString);
if ( min > Integer.parseInt(dataString)) min = Integer.parseInt(dataString);
if ( max < Integer.parseInt(dataString)) max = Integer.parseInt(dataString);
option =JOptionPane.showConfirmDialog(null, "Continue?");
}
JOptionPane.showMessageDialog(null, "Minimum: " + min + "
Maximum: " + max);
}