Java Swing - 如何為JFormattedTextField創(chuàng)建自定義java.text.Format

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import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.text.MaskFormatter;
import java.awt.FlowLayout;
import java.text.AttributedCharacterIterator;
import java.text.FieldPosition;
import java.text.Format;
import java.text.NumberFormat;
import java.text.ParsePosition;
public class Main {
  public static void main(String[] args) throws Exception {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(100, 75);
    JPanel content = new JPanel(new FlowLayout());
    frame.setContentPane(content);
    MaskFormatter formatter = new MaskFormatter("#");
    formatter.setValidCharacters("123456789");
    JFormattedTextField f1 = new JFormattedTextField(formatter);
    f1.setValue(null);
    f1.setColumns(1);
    content.add(f1);
    frame.setVisible(true);
  }
  private static Format createFormat() {
    NumberFormat format = NumberFormat.getInstance();
    format.setParseIntegerOnly(true);
 
 
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