Simple example of key press listener

            Simple key press listener

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   import java.awt.event.KeyAdapter;
    import java.awt.event.KeyEvent;
    import javax.swing.JFrame;
    import javax.swing.JTextField;
   
    public class Main {
   
        public static void main(String[] argv) throws Exception {
   
      JTextField textField = new JTextField();
   
      textField.addKeyListener(new MKeyListener());
   
      JFrame jframe = new JFrame();
   
      jframe.add(textField);
   
      jframe.setSize(400, 350);
   
      jframe.setVisible(true);
   
        }
    }
   
    class MKeyListener extends KeyAdapter {
   
        @Override
        public void keyPressed(KeyEvent event) {
   
      char ch = event.getKeyChar();
   
      if (ch == 'a' ||ch == 'b'||ch == 'c' ) {
   
    System.out.println(event.getKeyChar());
   
      }
   
      if (event.getKeyCode() == KeyEvent.VK_HOME) {
   
    System.out.println("Key codes: " + event.getKeyCode());
   
      }
    }
    }

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