Check if JTextField contains only letters or numbers

Question

I have a JTextField where the user can type anything. What is a convenient way to check if the String of TextField.getText() does contain letters or numbers only? Basically I just want to avoid any other symbol (eg _^$. etc)

Thank you in advance

Answer 1

You could consider using the String method matches which takes a regular expression as an argument and determines whether the string matches the regular expression. For example, alphanumeric can be represented by the regular expression [a-zA-Z0-9]+ which matches the patter any lower case letter or uppercase letter or number at least 1 time.

Consider the following code:

String text = "axc";
boolean match = text.matches("[a-zA-Z0-9]+");

You might want to go through this Java Tutorial on regular expressions

Answer 2

try this assign the value u get frm the text field to the variable "data".. and then use that regex to know if it contains letters or numbers and not caharacters

    String regex = "[a-zA-Z0-9]+"; 
    String data = "5hekkqhwj57586";
    System.out.println(data.matches(regex));