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    <blockquote> <p>Please tell me how to do this step by step.</p> </blockquote> <ol> <li><p>use JFormattedTextField with NumberFormatter</p> <ul> <li><p>restrict number of decimal places</p></li> <li><p>set various RoundingModes</p></li> <li><p>restrict range, set minimal and/or maximal value</p></li> </ul></li> <li><p>another of ways is to use JSpinner with SPinnerNUmberModel, but required to use DocumentFilter</p></li> </ol> <p>for example</p> <pre><code>import java.awt.*; import java.awt.font.TextAttribute; import java.math.*; import java.text.*; import java.util.Map; import javax.swing.*; import javax.swing.JFormattedTextField.*; import javax.swing.event.*; import javax.swing.text.InternationalFormatter; public class DocumentListenerAdapter { public DocumentListenerAdapter() { JFrame frame = new JFrame("AbstractTextField Test"); final JFormattedTextField textField1 = new JFormattedTextField(new Float(10.01)); textField1.setFormatterFactory(new AbstractFormatterFactory() { @Override public AbstractFormatter getFormatter(JFormattedTextField tf) { NumberFormat format = DecimalFormat.getInstance(); format.setMinimumFractionDigits(2); format.setMaximumFractionDigits(2); format.setRoundingMode(RoundingMode.HALF_UP); InternationalFormatter formatter = new InternationalFormatter(format); formatter.setAllowsInvalid(false); //formatter.setMinimum(0.0); //formatter.setMaximum(1000.00); return formatter; } }); final Map attributes = (new Font("Serif", Font.BOLD, 16)).getAttributes(); attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON); final JFormattedTextField textField2 = new JFormattedTextField(new Float(10.01)); textField2.setFormatterFactory(new AbstractFormatterFactory() { @Override public AbstractFormatter getFormatter(JFormattedTextField tf) { NumberFormat format = DecimalFormat.getInstance(); format.setMinimumFractionDigits(2); format.setMaximumFractionDigits(2); format.setRoundingMode(RoundingMode.HALF_UP); InternationalFormatter formatter = new InternationalFormatter(format); formatter.setAllowsInvalid(false); //formatter.setMinimum(0.0); //formatter.setMaximum(1000.00); return formatter; } }); textField2.getDocument().addDocumentListener(new DocumentListener() { @Override public void changedUpdate(DocumentEvent documentEvent) { printIt(documentEvent); } @Override public void insertUpdate(DocumentEvent documentEvent) { printIt(documentEvent); } @Override public void removeUpdate(DocumentEvent documentEvent) { printIt(documentEvent); } private void printIt(DocumentEvent documentEvent) { DocumentEvent.EventType type = documentEvent.getType(); double t1a1 = (((Number) textField2.getValue()).doubleValue()); if (t1a1 &gt; 1000) { Runnable doRun = new Runnable() { @Override public void run() { textField2.setFont(new Font(attributes)); textField2.setForeground(Color.red); } }; SwingUtilities.invokeLater(doRun); } else { Runnable doRun = new Runnable() { @Override public void run() { textField2.setFont(new Font("Serif", Font.BOLD, 16)); textField2.setForeground(Color.black); } }; SwingUtilities.invokeLater(doRun); } } }); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(textField1, BorderLayout.NORTH); frame.add(textField2, BorderLayout.SOUTH); frame.setVisible(true); frame.pack(); } public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { DocumentListenerAdapter main = new DocumentListenerAdapter(); } }); } } </code></pre>
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