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Of course you can also use an anonymous inner class, but if the validator is to be used on other components, too, a normal class is better.Also have a look at the SDK documentation: JComponent#set Input Verifier. All you have to do is validate the input string against the desired string pattern.In this case, the pattern seems to be one or more digits, followed by a period, AND exactly 4 digits after the decimal point.The code below demonstrates using As long as the text field does not contain a valid input, the error message is shown like the image below.That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2018, Oracle and/or its affiliates. If the validation fails the control needs to retain focus. I used to do this by just poping up a warning dialog when an OK button is pressed.I've read some articles about Document, it seems there is a better way to do text validations.
Submit a bug or feature For further API reference and developer documentation, see Java SE Documentation. What my question is, how to identify the control name which makes this event to be fired. One way would be to override the process Key Event method of your components.That way you can intercept an typed in characters and check to see if the user typed in a valid character. Hi I'm having a JMasked Text Field that accepts IPAddress, Now the problem is I need to set the IPAddress limits to 255.255.255.255 as max and also, if the user inputs 0.11, it takes it as 011.11_.11_.11_ How do I solve this problem ?!! Is there a swing component or an AWT component that accepts and sets the ... But if you shd make with std why don't you take useful to you code from "java Mail API" classes?Now I give you some requests below, I'd like to listen your suggestions on it, and then I'll implement it. Want to validate the textfield as soon as some invalid text is entered. If is Emp ID field, error message is shown as soon as some non-integer value is entered. I would like to enter multiple email addresses in a single text-field, separate them with a semi-colon, and still be able to validate the input.I had tried it to validate once the whole form is submitted,but unable to provide solution for the above situation. For only one email address, I could succeed fine (see sample code below).