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Java Swing - 如何創(chuàng)建自定義格式### - ## - #### for JFormattedTextField

我們想知道如何創(chuàng)建自定義格式### - ## - #### for JFormattedTextField。 
import java.awt.BorderLayout;

import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.text.MaskFormatter;

public class Main {
  public static void main(String[] args) throws Exception {
    MaskFormatter formatter = new MaskFormatter("###-##-####");
    JFormattedTextField tf = new JFormattedTextField(formatter);
    JPanel panel = new JPanel(new BorderLayout());
    panel.add(tf, BorderLayout.NORTH);
    JButton clickBtn = new JButton("Click me!");
    clickBtn.addActionListener(e->{
        if (!tf.getText().matches(formatter.getMask())) {
          System.err.println("Your Input does not match the pattern!");
        } else {
          System.out.println(tf.getText());
        }
    });
    panel.add(clickBtn, BorderLayout.SOUTH);
    JFrame f = new JFrame();

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(panel, BorderLayout.CENTER);
    f.setSize(800, 600);
    f.setVisible(true);
  }
}