I want to scan 123456789 and display 123 456 789 beside the prompt

[snowy365]

I know very little aboout coding and less of Java
Logic says I should be able to do something like this:

int i;
String taxFileNumber;
System.out.printf(" Enter Tax File Number (TFN): ");
for(i = 0; i < TFN_SIZE; i++)
{
if(i == 3 || i == 7)
{
taxFileNumber.charAt(i) = " ";
}else
{
taxFileNumber = input.next().charAt(i);
}
System.out.println();
}

Howsoever methinks my logic and ability do not sync
Any assistance would be greatly appreciated
TYIA

[stultuske]

that logic is very lousy indeed.
what if you enter other numbers? your formatting 'll be wrong.
you may rather want to format a String, and check it's size.
if the size = longer than 3, add a space on the 4th last place.
and so on, and so forth.

[JamesCherrill]

Strings in Java are immutable - you cannot change them.
Have a look at StringBuilder which is like a String but you can do stuff like inserting blanks into the middle of it...