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    <p>1) consider using <a href="http://download.oracle.com/javase/tutorial/uiswing/components/spinner.html" rel="nofollow noreferrer">JSpinner</a> instead of <code>JFormattedTextField</code> because there you can set <a href="http://download.oracle.com/javase/6/docs/api/javax/swing/SpinnerNumberModel.html" rel="nofollow noreferrer">SpinnerNumberModel</a> for initial values </p> <p>from API</p> <pre><code>Integer value = new Integer(50); Integer min = new Integer(0); Integer max = new Integer(100); Integer step = new Integer(1); </code></pre> <p>and with simple hack for <code>JSpinner</code> (with <code>SpinnerNumberModel</code>) it doesn't allows another input as Digits, otherwise is there possible input any of <code>Chars</code></p> <p>2) for <code>JFormattedTextField</code> you have to implements</p> <ul> <li>DocumentListener</li> <li>Document</li> </ul> <p>and of both cases for <code>JFormattedTextField</code> you have to write workaround for catch if value is less or more than required range ...</p> <p>EDIT:</p> <p>.</p> <p><img src="https://i.stack.imgur.com/3kpA8.jpg" alt="enter image description here"></p> <p>.</p> <p>not true at all, :-) you are so far from ... simple wrong :-), there is small mistake with your result, please look at this code</p> <pre><code>import java.awt.BorderLayout; import java.text.NumberFormat; import javax.swing.*; import javax.swing.text.*; public class TestDigitsOnlySpinner { public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { JFrame frame = new JFrame("enter digit"); JSpinner jspinner = makeDigitsOnlySpinnerUsingDocumentFilter(); frame.getContentPane().add(jspinner, BorderLayout.CENTER); frame.getContentPane().add(new JButton("just another widget"), BorderLayout.SOUTH); frame.pack(); frame.setVisible(true); } private JSpinner makeDigitsOnlySpinnerUsingDocumentFilter() { JSpinner spinner = new JSpinner(new SpinnerNumberModel()); JSpinner.NumberEditor jsEditor = (JSpinner.NumberEditor) spinner.getEditor(); JFormattedTextField textField = jsEditor.getTextField(); final DocumentFilter digitOnlyFilter = new DocumentFilter() { @Override public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException { if (stringContainsOnlyDigits(string)) { super.insertString(fb, offset, string, attr); } } @Override public void remove(FilterBypass fb, int offset, int length) throws BadLocationException { super.remove(fb, offset, length); } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { if (stringContainsOnlyDigits(text)) { super.replace(fb, offset, length, text, attrs); } } private boolean stringContainsOnlyDigits(String text) { for (int i = 0; i &lt; text.length(); i++) { if (!Character.isDigit(text.charAt(i))) { return false; } } return true; } }; /*NumberFormat format = NumberFormat.getIntegerInstance(); format.setGroupingUsed(false);// or add the group chars to the filter NumberFormat format = NumberFormat.getInstance();*/ NumberFormat format = NumberFormat.getPercentInstance(); format.setGroupingUsed(false); format.setGroupingUsed(true);// or add the group chars to the filter format.setMaximumIntegerDigits(10); format.setMaximumFractionDigits(2); format.setMinimumFractionDigits(5); textField.setFormatterFactory(new DefaultFormatterFactory(new InternationalFormatter(format) { private static final long serialVersionUID = 1L; @Override protected DocumentFilter getDocumentFilter() { return digitOnlyFilter; } })); return spinner; } }); } } </code></pre>
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    1. POJFormattedTextField to format percent numbers?
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    1. USmKorbel
    1. USmKorbel
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    1. COObviously it is not possible to get a component which behaves like I described in my question. At least not with standard Swing components or a few simple tricks. I am now using a JSpinner with a range from 0 - 100 (as you suggested), convert the values to float manually and ignore the absence of the percent sign. With setting allowsInvalid to false and overwriteMode to true in the NumberFormatter of the embedded JFormattedTextField the behavior is ok for my needs.
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      1. USRoland Schneider
    2. CO@Roland please see my EDIT
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      1. USmKorbel
    3. COThank you. However there are still some issues with this code. When the percent or decimal separator sign is removed, there is no way to get them back. Both can be fixed in the DocumentFilter with a few more ifs. Quite a lot of effort for such a simple task. ;)
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      1. USRoland Schneider
 

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