quick question: I have a JTextField for user input, in my focus listener, when the JTextField loses focus, how can I check that the data in the JTextField is a number? thanks
Try performing Integer.parseInt(yourString)
and if it throws a NumberFormatException
you'll know the string isn't a valid integer
try {
Integer.parseInt(myString);
System.out.println("An integer"):
}
catch (NumberFormatException e) {
//Not an integer
}
Another alternative is Regex:
boolean isInteger = Pattern.matches("^\d*$", myString);