How to Make JTextField Accept Only Alphabet

In this tutorial, we are going to see how to make JTextField accept only alphabet. JTextField is a Swing component, so there must be a listener object for it to be useful. You can add KeyListener to prevent the user from entering special characters, spaces, numbers, etc. in a JTextField.

 

Example:

JTextField textField = new JTextField(15);
   
textField.addKeyListener(new KeyAdapter() {
	public void keyTyped(KeyEvent e) {
		char c = e.getKeyChar();
		   if(!(Character.isAlphabetic(c) || (c==KeyEvent.VK_BACK_SPACE) || c==KeyEvent.VK_DELETE )) {
			  e.consume();  // ignore the event if it's not an alphabet
		}
	 }
});

Here we ignore the captured event if it is a special character, space, or number.
 

 

Complete Example : How to Make JTextField Accept Only Alphabet

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

public class OnlyAlphabet extends JFrame 
{  
   public static void main(String[]args){
      new OnlyAlphabet().initComponent();
   }
   public void initComponent() {
      setLayout(new FlowLayout());
      JLabel lbl = new JLabel("Enter text: ");
      JTextField textField = new JTextField(15);
      add(lbl);
      add(textField);
   
      textField.addKeyListener(new KeyAdapter() {
         public void keyTyped(KeyEvent e) {
             char c = e.getKeyChar();
             if(!(Character.isAlphabetic(c) || (c==KeyEvent.VK_BACK_SPACE) || c==KeyEvent.VK_DELETE )) {
                 e.consume();  // ignore the event if it's not an alphabet
             }
         }
      });
   
      setSize(300,70);
      setLocationRelativeTo(null);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setVisible(true);
   }
}

Output:

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