Gui programming (reply to ivcho)

Question

hello ivo,
many thanks for helping me. It worked correctly 11 times, but in the 12th time again 3 Textfields were not visible on the screen. (If I print out the visible-property in the Java Console, it is always reported as visible = true).
Maybe I implemented Your tip wrongly, therefore I show to You how I did it (If You would like to know the complete code, please let me know it):
public class asn055_aendern extends Applet  implements  Runnable, FocusListener, KeyListener, MouseListener, ActionListener, ComponentListener, WindowListener, ItemListener{
    wFrame        f = new wFrame();
    Panel pvorname = new Panel(null);
    TextField tvorname = new TextField(20);    
    //other panels and textfields (every Textfield has its own panel)
    public void init(){
       //Frame f
        f.setBounds((int)fleft,(int)ftop,(int)fwidth,(int)fheight);
        f.setLayout (null);
        f.setBackground(Color.cyan);
        f.setName("ddd");
        f.addComponentListener(this);     
        f.addKeyListener(this);
        f.addFocusListener(this);
        f.addWindowListener(this);
        //tvorname
        tvorname.setBackground(Color.white);
        tvorname.addKeyListener(this);
        tvorname.addActionListener(this);
        tvorname.setName("tvorname"); 
        tvorname.setEnabled(true);
        pvorname.add(tvorname);
        f.add(pvorname); 
         //other Textfields
    }//End of init
   public void start() {
     f.setVisible(true);
     if(t==null){t=new Thread(this); t.start();}
   }//End of start
   public void run() {
         f.setVisible(true);
         tvorname.setText   ("anyvorname");
         wartesek(1); //the program waits one second 
         fwidth=f.getBounds().width;
         double heighttextfield= fheight*0.052;
         fsz = (int)(0.023*(double)fwidth);
         Font ftt = new Font ("SansSerif",Font.BOLD,fsz);
        //tvorname
         tvorname.setFont(ftt);               
         pvorname.setBackground(Color.yellow);
         tvorname.setBackground(Color.green);
         pvorname.setBounds((int)(left1), (int)(top1+heightlabel), (int)(width16), (int)(heighttextfield));
         tvorname.setBounds((int)(0), (int)(0), (int)(width16), (int)(heighttextfield));
         tvorname.setVisible(true);
         pvorname.setVisible(true);
         //other Textfields
         tvorname.requestFocus();
         //more Code
   }//End of run
   class wFrame extends java.awt.Frame {
     public void paint(Graphics g) {
       super.paint(g);
     }//Ende paint
   }//Ende class wFrame
}//End of class asn055_aendern

Answer 1

hello ivo,
yes, all of my TextFieds are added to wFrame, since I changed the Class of f from Frame to wFrame to implent the paint-methode in it, So i could override the paint-methode like You told me. But ithink that is not the problem, because the behaviour of the program is the same, no matter with wFrame or Frame. There must be another reason.
Greetings,
Alex