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    <p>Here is a sample program, for you where, as you enter the fourth time into the TextPane it will beep, without even you pressing the <kbd>Enter</kbd> key:</p> <pre><code>import javax.swing.*; import javax.swing.text.*; import java.awt.Toolkit; public class TextPaneLimit extends JFrame { private JPanel panel; private JTextPane tpane; private AbstractDocument abDoc; public TextPaneLimit() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLocationRelativeTo(null); panel = new JPanel(); tpane = new JTextPane(); Document doc = tpane.getStyledDocument(); if (doc instanceof AbstractDocument) { abDoc = (AbstractDocument)doc; abDoc.setDocumentFilter(new DocumentSizeFilter(3)); } panel.add(tpane); add(panel); pack(); } public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new TextPaneLimit().setVisible(true); } }); } } class DocumentSizeFilter extends DocumentFilter { private int max_Characters; private boolean DEBUG; public DocumentSizeFilter(int max_Chars) { max_Characters = max_Chars; DEBUG = false; } public void insertString(FilterBypass fb , int offset , String str , AttributeSet a) throws BadLocationException { if (DEBUG) { System.out.println("In DocumentSizeFilter's insertString method"); } if ((fb.getDocument().getLength() + str.length()) &lt;= max_Characters) super.insertString(fb, offset, str, a); else Toolkit.getDefaultToolkit().beep(); } public void replace(FilterBypass fb , int offset, int length , String str, AttributeSet a) throws BadLocationException { if (DEBUG) { System.out.println("In DocumentSizeFilter's replace method"); } if ((fb.getDocument().getLength() + str.length() - length) &lt;= max_Characters) super.replace(fb, offset, length, str, a); else Toolkit.getDefaultToolkit().beep(); } } </code></pre> <p>Hope this might help.</p>
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    1. POHow do I limit the amount of characters in JTextPane as the user types (Java)
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    1. COYes, I tried this example from Oracle's site with no luck of the desired beep as the user presses a key.
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    2. CO@Boundless : Do check this program, i just made, here you don't have to press any Enter key for beep to happen. Simply try to add the fourth character and it will beep. Regards
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    3. COI tried it, and it works as needed. Thank you, I'll try using it for my needs.
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