🚀 go-pugleaf

Hi, everyone,

    I met a problem with keypress respond. See the code below:

public class mainFrame extends Frame {
    ...
    public mainFrame() {//constructor;
        ...
        //{{REGISTER_LISTENERS
          SymKey aSymKey = new SymKey();
          this.addKeyListener(aSymKey);
         //}}
    }
    ...
    class SymKey extends java.awt.event.KeyAdapter
     {
      public void keyPressed(java.awt.event.KeyEvent event)
      {
           Object object = event.getSource();
           if (object == mainFrame.this)
            mainFrame_KeyPress(event);
      }
     }

     void mainFrame_KeyPress(java.awt.event.KeyEvent event)
     {
          // to do: code goes here.
          int nKeyCode = event.getKeyCode();
          String sKeyText = event.getKeyText(nKeyCode);
          System.out.println("Key Press : " + sKeyText);
     }
}
// end of All.

 Then, I press some key, just 'A','B', 'C', but there is no respond at
all !
No output at all !

  Are there some mistakes in my code ?  If the class Frame and its
subclass can not respond to key actions ?

    Somebody help !

  Thanks.