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  1. PO
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    <p>Ok, I've made it. The solution is far from simple, but at least it does exactly what I want. Except for returning doubles instead of floats. One major limitation is that it does not allow fraction digits, but for now I can live with that.</p> <pre><code>import java.awt.BorderLayout; import java.text.NumberFormat; import java.text.ParseException; import javax.swing.JComponent; import javax.swing.JFormattedTextField; import javax.swing.JSpinner; import javax.swing.SpinnerNumberModel; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultFormatterFactory; import javax.swing.text.DocumentFilter; import javax.swing.text.NavigationFilter; import javax.swing.text.NumberFormatter; import javax.swing.text.SimpleAttributeSet; import javax.swing.text.Position.Bias; public class JPercentField extends JComponent { private static final double MIN_VALUE = 0.0d; private static final double MAX_VALUE = 1.0d; private static final double STEP_SIZE = 0.01d; private static final long serialVersionUID = -779235114254706347L; private JSpinner spinner; public JPercentField() { initComponents(); initLayout(); spinner.setValue(MIN_VALUE); } private void initComponents() { SpinnerNumberModel model = new SpinnerNumberModel(MIN_VALUE, MIN_VALUE, MAX_VALUE, STEP_SIZE); spinner = new JSpinner(model); initSpinnerTextField(); } private void initSpinnerTextField() { DocumentFilter digitOnlyFilter = new PercentDocumentFilter(getMaximumDigits()); NavigationFilter navigationFilter = new BlockLastCharacterNavigationFilter(getTextField()); getTextField().setFormatterFactory( new DefaultFormatterFactory(new PercentNumberFormatter(createPercentFormat(), navigationFilter, digitOnlyFilter))); getTextField().setColumns(6); } private int getMaximumDigits() { return Integer.toString((int) MAX_VALUE * 100).length(); } private JFormattedTextField getTextField() { JSpinner.NumberEditor jsEditor = (JSpinner.NumberEditor) spinner.getEditor(); JFormattedTextField textField = jsEditor.getTextField(); return textField; } private NumberFormat createPercentFormat() { NumberFormat format = NumberFormat.getPercentInstance(); format.setGroupingUsed(false); format.setMaximumIntegerDigits(getMaximumDigits()); format.setMaximumFractionDigits(0); return format; } private void initLayout() { setLayout(new BorderLayout()); add(spinner, BorderLayout.CENTER); } public double getPercent() { return (Double) spinner.getValue(); } public void setPercent(double percent) { spinner.setValue(percent); } private static class PercentNumberFormatter extends NumberFormatter { private static final long serialVersionUID = -1172071312046039349L; private final NavigationFilter navigationFilter; private final DocumentFilter digitOnlyFilter; private PercentNumberFormatter(NumberFormat format, NavigationFilter navigationFilter, DocumentFilter digitOnlyFilter) { super(format); this.navigationFilter = navigationFilter; this.digitOnlyFilter = digitOnlyFilter; } @Override protected NavigationFilter getNavigationFilter() { return navigationFilter; } @Override protected DocumentFilter getDocumentFilter() { return digitOnlyFilter; } @Override public Class&lt;?&gt; getValueClass() { return Double.class; } @Override public Object stringToValue(String text) throws ParseException { Double value = (Double) super.stringToValue(text); return Math.max(MIN_VALUE, Math.min(MAX_VALUE, value)); } } /** * NavigationFilter that avoids navigating beyond the percent sign. */ private static class BlockLastCharacterNavigationFilter extends NavigationFilter { private JFormattedTextField textField; private BlockLastCharacterNavigationFilter(JFormattedTextField textField) { this.textField = textField; } @Override public void setDot(FilterBypass fb, int dot, Bias bias) { super.setDot(fb, correctDot(fb, dot), bias); } @Override public void moveDot(FilterBypass fb, int dot, Bias bias) { super.moveDot(fb, correctDot(fb, dot), bias); } private int correctDot(FilterBypass fb, int dot) { // Avoid selecting the percent sign int lastDot = Math.max(0, textField.getText().length() - 1); return dot &gt; lastDot ? lastDot : dot; } } private static class PercentDocumentFilter extends DocumentFilter { private int maxiumDigits; public PercentDocumentFilter(int maxiumDigits) { super(); this.maxiumDigits = maxiumDigits; } @Override public void insertString(FilterBypass fb, int offset, String text, AttributeSet attrs) throws BadLocationException { // Mapping an insert as a replace without removing replace(fb, offset, 0, text, attrs); } @Override public void remove(FilterBypass fb, int offset, int length) throws BadLocationException { // Mapping a remove as a replace without inserting replace(fb, offset, length, "", SimpleAttributeSet.EMPTY); } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { int replaceLength = correctReplaceLength(fb, offset, length); String cleanInput = truncateInputString(fb, filterDigits(text), replaceLength); super.replace(fb, offset, replaceLength, cleanInput, attrs); } /** * Removes all non-digit characters */ private String filterDigits(String text) throws BadLocationException { StringBuilder sb = new StringBuilder(text); for (int i = 0, n = sb.length(); i &lt; n; i++) { if (!Character.isDigit(text.charAt(i))) { sb.deleteCharAt(i); } } return sb.toString(); } /** * Removes all characters with which the resulting text would exceed the maximum number of digits */ private String truncateInputString(FilterBypass fb, String filterDigits, int replaceLength) { StringBuilder sb = new StringBuilder(filterDigits); int currentTextLength = fb.getDocument().getLength() - replaceLength - 1; for (int i = 0; i &lt; sb.length() &amp;&amp; currentTextLength + sb.length() &gt; maxiumDigits; i++) { sb.deleteCharAt(i); } return sb.toString(); } private int correctReplaceLength(FilterBypass fb, int offset, int length) { if (offset + length &gt;= fb.getDocument().getLength()) { // Don't delete the percent sign return offset + length - fb.getDocument().getLength(); } return length; } } } </code></pre>
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    1. COreally so long code my +1 for distribute solution
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      1. USmKorbel
 

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