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jTextField in swing
1 Answer(s)      a year and 9 months ago
Posted in : Java Beginners


I am new to java and i am making a registration form.i just want to know if there is any code in which a string cannot be inserted in a jtextfield where a phone number has to be inserted.the jtextfield should not respond to any character in jtextfield.plzz help


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December 4, 2012 at 3:01 PM


Here is an example that accept the numbers only through the jtextfield.

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

class TextValidation extends JFrame{
JTextField text;
JLabel label;
JPanel p;
TextValidation(){
text=new JTextField(15);
label=new JLabel("Enter number:");
p=new JPanel();
p.add(label);
p.add(text);
text.addKeyListener(new KeyAdapter(){
            public void keyPressed(KeyEvent e){

                char ch = e.getKeyChar();
                if(Character.isDigit(ch)){
                }
                else{
                    JOptionPane.showMessageDialog(null, "Only numbers are allowed!");
                    text.setText(" ");
                }
            }
});
add(p);
setVisible(true);
setSize(300,100);
}
public static void main(String[]args){
TextValidation v=new TextValidation();
}
}


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