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15644901
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2013-03-26T18:39:37.247
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2013-03-26T18:39:37.247
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<p>For the above answer below is a Utility method I have created to deal with above situations -</p> <pre><code> /** * Method installNumericMaximumCharacters. * * @param document * AbstractDocument * @param numberofChars * int */ public static void installNumericMaximumCharacters( AbstractDocument document, final int numberofChars) { document.setDocumentFilter(new DocumentFilter() { @Override public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException { try { if (string.equals(".") && !fb.getDocument() .getText(0, fb.getDocument().getLength()) .contains(".")) { super.insertString(fb, offset, string, attr); return; } Double.parseDouble(string); if (fb.getDocument().getLength() + string.length() <= numberofChars) { super.insertString(fb, offset, string, attr); } else { Toolkit.getDefaultToolkit().beep(); } } catch (Exception e) { Toolkit.getDefaultToolkit().beep(); } } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { try { if (text.equals(".") && !fb.getDocument() .getText(0, fb.getDocument().getLength()) .contains(".")) { super.insertString(fb, offset, text, attrs); return; } Double.parseDouble(text); int l = fb.getDocument().getLength() - length + text.length(); if (length > 0) { fb.getDocument().remove(offset, length); } if (l <= numberofChars) { super.insertString(fb, offset, text, attrs); } else { Toolkit.getDefaultToolkit().beep(); } } catch (Exception e) { Toolkit.getDefaultToolkit().beep(); } } }); } </code></pre> <p>The method is bit self explanatory. When ever a change occurs on the <code>Document</code> it will evoke the <code>DocumentFilter</code>. Beware that you cannot <code>setText()</code> the same <code>Document</code>. You will have to use the <code>FilterBypass</code> object for it. </p>
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