I'm a bit confused as to what you're saying :icon_confused: But I do understand that you want to only allow real input with two decimal places. If you have a GUI then JFormattedTextField is the class you're looking for and this is how you'd use it:
NumberFormat real = NumberFormat.getNumberInstance();
JFormattedTextField dataInput = new JFormattedTextField(real);
What actually happens is that if you type in a number with too many decimal places, you'd see that the text field would automatically remove them. That's 'cause we .setMaximumFractionDigits(2) . We can also automatically enforce that two decimal places must be met by using real.setMinimumFractionDigits(2); and even if the user types 1, the input will change to 1.00 (after the user has changed focus to another GUI component).
I haven't actually tried to do that via a console. I would imagine that unless you read in the value, you wouldn't really know how many decimal places are there... but of course where there is Java there is a way :icon_cool: