Hi Friend,

Try this:

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

public class CheckTextFieldValue extends Frame{
    CheckTextFieldValue(){
    Label lab=new Label("Enter Numeric Value: ");
        final TextField text=new TextField(20);
        Button b=new Button("Check");
        lab.setBounds(20,50,150,20);
        text.setBounds(180,50,150,20);
        b.setBounds(180,80,80,20);
        setLayout(null);
        add(lab);
        add(text);
        add(b);
        setSize(350,130);
        setVisible(true);
        b.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
            String input=text.getText();
            Pattern p = Pattern.compile("[A-Z,a-z,&%$#@!()*^]");
            Matcher m = p.matcher(input);
            if (m.find()){
            JOptionPane.showMessageDialog(null,"Invalid Number!\nYou must enter only digits between 0 and 9","Error",JOptionPane.ERROR_MESSAGE);
            text.setText("");
            }
            }
        });
    }
    public static void main(String[] args){
        new CheckTextFieldValue();
    }
            }

Thank