How to limit JTextArea to a valid character set?

Question

Does anyone know if there is an easy way to limit valid characters to JTextArea. That is similar to JTextField, using MaskFormatter.

In particular, I want to restrict valid characters for JTextArea to only uppercase letters and only very limited character sets, for example! "# ¤% & / () =

Answer 1

Enter a javax.swing.text.DocumentFilterto remove inappropriate characters. Install it on your favorite AbstractDocumentand create with it JTextArea.

Answer 2

Chaining Document Filters. ( ), , ( ).

Answer 3

PlainDocument insertString(), . JTextArea.

Answer 4

JTextArea. insertString DocumentFilter,