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copied!<p>there are three ways starting with easiest, ending with useless, maybe nonsense in comparing with points 1st and 2nd.</p> <ul> <li>use <code>NumberFormat.getCurrencyInstance();</code> or <code>NumberFormat.getCurrencyInstance(Locale);</code> for <code>Currency symbol</code>, then this value is valid for concrete <code>JTextField</code> / <code>JFormattedTextField</code> / <code>JSpinner</code> / <code>XxxCellRenderer</code> / <code>XxxCellEditor</code>,</li> </ul> <p>code</p> <pre><code>import java.awt.GridLayout; import java.math.RoundingMode; import java.text.NumberFormat; import javax.swing.JFormattedTextField; import javax.swing.JFrame; import javax.swing.text.NumberFormatter; public class MaskFormatterTest { public static void main(String[] args) throws Exception { //NumberFormat format = NumberFormat.getNumberInstance(); NumberFormat format = NumberFormat.getCurrencyInstance(); format.setMaximumFractionDigits(2); format.setMinimumFractionDigits(2); format.setParseIntegerOnly(true); format.setRoundingMode(RoundingMode.HALF_UP); NumberFormatter formatter = new NumberFormatter(format); formatter.setMaximum(1000.0); formatter.setMinimum(0.0); formatter.setAllowsInvalid(false); formatter.setOverwriteMode(false); JFormattedTextField tf = new JFormattedTextField(formatter); tf.setColumns(10); tf.setValue(123456789.99); JFormattedTextField tf1 = new JFormattedTextField(formatter); tf1.setValue(1234567890.99); JFormattedTextField tf2 = new JFormattedTextField(formatter); tf2.setValue(1111.1111); JFormattedTextField tf3 = new JFormattedTextField(formatter); tf3.setValue(-1111.1111); JFormattedTextField tf4 = new JFormattedTextField(formatter); tf4.setValue(-56); JFrame frame = new JFrame("Test"); frame.setLayout(new GridLayout(5, 0)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(tf); frame.add(tf1); frame.add(tf2); frame.add(tf3); frame.add(tf4); frame.pack(); frame.setVisible(true); } } </code></pre> <p>.</p> <ul> <li>apply own <code>NavigationFilter</code>, fixed possition could be on the start or ending for possition (Bias) in <code>JTextField</code> / <code>JFormattedTextField</code> / <code>JSpinner</code> / <code>XxxCellRenderer</code> / <code>XxxCellEditor</code>,</li> </ul> <p>code</p> <pre><code>//@see & read http://stackoverflow.com/questions/7421337/limited-selection-in-a-jtextfield-jtextcomponent import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; public class NavigationFilterPrefixWithBackspace extends NavigationFilter { private int prefixLength; private Action deletePrevious; public NavigationFilterPrefixWithBackspace(int prefixLength, JTextComponent component) { this.prefixLength = prefixLength; deletePrevious = component.getActionMap().get("delete-previous"); component.getActionMap().put("delete-previous", new BackspaceAction()); component.setCaretPosition(prefixLength); } @Override public void setDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) { fb.setDot(Math.max(dot, prefixLength), bias); } @Override public void moveDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) { fb.moveDot(Math.max(dot, prefixLength), bias); } class BackspaceAction extends AbstractAction { private static final long serialVersionUID = 1L; public void actionPerformed(ActionEvent e) { JTextComponent component = (JTextComponent) e.getSource(); if (component.getCaretPosition() > prefixLength) { deletePrevious.actionPerformed(null); } } } public static void main(String args[]) throws Exception { JTextField textField = new JTextField("Prefix_", 20); textField.setNavigationFilter(new NavigationFilterPrefixWithBackspace(7, textField)); JFrame frame = new JFrame("Navigation Filter Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(textField); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } } </code></pre> <p>.</p> <ul> <li>create own <code>InputMask</code> with <code>InputVerifier</code>, workaroung could / couldn't be different for (each of) <code>JTextField</code> / <code>JFormattedTextField</code> / <code>JSpinner</code> / <code>XxxCellRenderer</code> / <code>XxxCellEditor</code>,</li> </ul>

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