DocumentFilter只允许数字和句点(.)进入JTextField？

import javax.swing.*;
import javax.swing.text.AbstractDocument;
import javax.swing.text.DocumentFilter;

public class JTextFieldExample {
   public static void main(String[] args) {
      JTextField textField = new JTextField();

      // 过滤只允许数字和句点(.)输入
      DocumentFilter documentFilter = new DocumentFilter() {
         public void insertString(DocumentFilter.FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException {
            string = string.replaceAll("[\\D\\.]", ""); // 移除非数字和句点字符
            fb.insertString(offset, string, attr);
         }

         public void remove(DocumentFilter.FilterBypass fb, int offset, int length) throws BadLocationException {
            fb.remove(offset, length);
         }

         public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
            text = text.replaceAll("[\\D\\.]", ""); // 移除非数字和句点字符
            fb.replace(offset, length, text, attrs);
         }
      };

      ((AbstractDocument) textField.getDocument()).setDocumentFilter(documentFilter);

      JFrame frame = new JFrame("JTextField Example");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.add(textField);
      frame.pack();
      frame.setVisible(true);
   }
}