Java tutorial
import java.awt.Container; import java.text.ParseException; import javax.swing.BoxLayout; import javax.swing.JFormattedTextField; import javax.swing.JFrame; import javax.swing.text.MaskFormatter; public class Main { public static void main(String args[]) throws ParseException { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container content = f.getContentPane(); content.setLayout(new BoxLayout(content, BoxLayout.PAGE_AXIS)); MaskFormatter mf1 = new MaskFormatter("###-###-###"); mf1.setPlaceholderCharacter('_'); JFormattedTextField ftf1 = new JFormattedTextField(mf1); content.add(ftf1); MaskFormatter mf2 = new MaskFormatter("(###) ###-####"); JFormattedTextField ftf2 = new JFormattedTextField(mf2); content.add(ftf2); f.setSize(300, 100); f.setVisible(true); } }