Java Swing - 如何從DefaultFormatterFactory創(chuàng)建JFormattedTextField

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import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.NumberFormat;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.text.DefaultFormatterFactory;
import javax.swing.text.NumberFormatter;
public class Main extends JPanel implements PropertyChangeListener {
  double amount = 100000;
  JFormattedTextField amountField;
  NumberFormat amountDisplayFormat;
  NumberFormat amountEditFormat;
  public Main() {
    super(new BorderLayout());
    amountDisplayFormat = NumberFormat.getCurrencyInstance();
    System.out.println(amountDisplayFormat.format(1200));
    amountDisplayFormat.setMinimumFractionDigits(0);
    amountEditFormat = NumberFormat.getNumberInstance();
    amountField = new JFormattedTextField(new DefaultFormatterFactory(
        new NumberFormatter(amountDisplayFormat), new NumberFormatter(
            amountDisplayFormat), new NumberFormatter(amountEditFormat)));
    amountField.setValue(new Double(amount));
    amountField.setColumns(10);
    amountField.addPropertyChangeListener("value", this);
 
 
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