CODEWITHSUNDEEP
javaswingnumbersjtextarea
user1628407
user1628407

Reputation: 139

JTextArea - only digit

I need JTextArea, not JFormattedTextField, because I want 3 lines and on each lines one digits, how can I do it?

Upvotes: 3

Views: 665

Answers (1)

Hovercraft Full Of Eels
Hovercraft Full Of Eels

Reputation: 285405

Extract the Document from the JTextArea, cast it to a PlainDocument and then add a DocumentFilter to the Document, filtering out all un-allowed input.

Please click this link for the Document Filter Tutorial.

For an example of the opposite, a DocumentFilter which prevents the user from typing numbers into the document, please see: Using DocumentFilter.FilterBypass. It would be easy to adapt this to your needs.

Upvotes: 5

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