jformattedtextfielddemo.java

只能输入数字的JTextField,在java编程里面很有用哦,可以省去验证输入是否为数字额麻烦

import javax.swing.*;
import javax.swing.text.*;


class JFormattedTextFieldDemo
{
	public static void main(String[] args)
    {
    	JFrame f=new JFrame();
    	try
		{
			MaskFormatter formatter=new MaskFormatter("###.###.###.###");
			formatter.setPlaceholderCharacter('0');
			JFormattedTextField ftField=new JFormattedTextField(formatter);
			f.getContentPane().add(ftField);
	    	f.pack();
	    	f.setVisible(true);
		}catch(Exception e)
		{
			e.printStackTrace();
		}
	
    	
    	
    }
}