即使JFormattedTextField实现DecimalFormat和NumberFormat ，也会使用DocumentListener ，

1)通过使用DecimalFormat或NumberFormat简单的User-non-Acceptable通过实现setMinimum()和setMaximum()

2) JTextComponents在默认情况下实现插入文本，然后通过实现setMinimum()和setMaximum()来实现具有DecimalFormat或NumberFormat的JFormattedTextField User-non-Acceptable的任何解决方法。

3)它非常舒适的使用DocumentListener允许添加任何数量，但突出显示范围

4)或与SpinnerNumberModel使用JSpinner ，可以将Formatter设置为Number Instance

例如将InternationalFormatter和DocumentListener结合在一起

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 static void main(String args[]) { 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 > 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(); } private DocumentListenerAdapter() { } }