Check size of input
 

How would i go about checking the length of the input the user has put into a text field...

What I want to be able to do is check if what they have entered is between 3 and 20 characters long.. then if its less than 3 or more than 20 use an alert to tell them they must enter a username between 3 and 20 characters.

Thanks

use text.length property

public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
String x;
System.out.print("Input text -> ");
x = scan.nextLine();
while(x.length() < 3 || x.length() >20) {
System.out.print("Word length must be between 3 and 20 -> ");
x = scan.nextLine();
}
System.out.println("Text length: " + x.length());
}

Something like this i asume?

You have to check variable length or textbox character length right, than you get text from text box and store it in variable and check its length properties, easily you will find out length of text.

We can check the length of the input easily be using some syntax like
text.length.

hey i agree with you my friend.

You may use the "text.length" property