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POMaskFormatter with Regex
 

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  1. POMaskFormatter with Regex
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    <p>I'm trying to make a textfield that is set to accept floats and I am using regex for this.. I'm having a problem because when I input the number for example 12345.67 then when I try to erase the input I cant erase the number 1.. why?></p> <pre><code>import javax.swing.*; import javax.swing.text.*; public class DecimalFormatter extends DefaultFormatter { protected java.util.regex.Matcher matcher; public DecimalFormatter(java.util.regex.Pattern regex) { setOverwriteMode(false); matcher = regex.matcher(""); } public Object stringToValue(String string) throws java.text.ParseException { if (string == null) return null; matcher.reset(string); if (! matcher.matches()) throw new java.text.ParseException("does not match regex", 0); return super.stringToValue(string); } public static void main(String argv[]) { JLabel lab1 = new JLabel("Decimal:"); java.util.regex.Pattern Decimal = java.util.regex.Pattern.compile("^[1-9]\\d{0,4}([.]\\d{0,2})?$", java.util.regex.Pattern.CASE_INSENSITIVE); DecimalFormatter decimalFormatter = new DecimalFormatter(Decimal); decimalFormatter.setAllowsInvalid(false); JFormattedTextField ftf1 = new JFormattedTextField(decimalFormatter); JFrame f = new JFrame("DecimalFormatter Demo"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel pan1 = new JPanel(new java.awt.BorderLayout()); pan1.add(lab1, java.awt.BorderLayout.WEST); pan1.add(ftf1, java.awt.BorderLayout.CENTER); lab1.setLabelFor(ftf1); f.getContentPane().add(pan1, java.awt.BorderLayout.SOUTH); f.setSize(300, 80); f.setVisible(true); } } </code></pre>
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