[Felissa]

If you look at the JFrame API, you'll notice that it inherits from Component, which provides the addKeyListener(KeyListener) method.
JFrame

Code:

import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.event.KeyListener;
 import java.awt.event.KeyEvent;
 
 import javax.swing.JFrame;
 import javax.swing.JPanel;
 
 public class KeyListenerExample extends JFrame {
     public KeyListenerExample() {
         super ("KeyListener Example");
         
         JPanel panel = (JPanel) getContentPane();
         panel.setPreferredSize(new Dimension(800, 600));
         panel.setLayout(null);
         
         pack();
         setResizable(false);
         setVisible(true);
 
         addKeyListener(new KeyListener() {
             public void keyPressed(KeyEvent e) {
                 System.out.println("keyPressed: " + e.getKeyChar());
             }
             
             public void keyTyped(KeyEvent e) {
                 System.out.println("keyTyped: " + e.getKeyChar());
             }
             
             public void keyReleased(KeyEvent e) {
                 System.out.println("keyReleased: " + e.getKeyChar());
             }
         });
      }
     
     static public void main(String[] args) {
          new KeyListenerExample();
      }
 }

Greetings.

Felissa