Hi Friend,

Try the following code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.regex.*;

public class TextFieldBorderColor extends JFrame{
JTextField text1,text2;
JLabel label1,label2;
JPanel panel;
JButton b;
public TextFieldBorderColor(){
label1=new JLabel("Enter Name");
text1=new JTextField(10);
b=new JButton("Submit");
panel=new JPanel(new GridLayout(2,2));
panel.add(label1);
panel.add(text1);
panel.add(b);
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String value1=text1.getText();
Pattern p = Pattern.compile("[0-9]");
Matcher m = p.matcher(value1);
if (m.find()) {
text1.setBorder(BorderFactory.createLineBorder(Color.red));
}
}
});
add(panel);
setVisible(true);
pack();
}
public static void main(String[] args) {
TextFieldBorderColor color=new TextFieldBorderColor();
}
}
Thanks