Processing 2.0b6 on Linux Ubuntu 12.04

While
println(3456/10);
gives : 345

println(03456/10);
answers : 183

and the same with :
println(003456/10); ->183
and
println(0003456/10); ->183

and same problem with integer numerator and float denominator:
println(03456/10.0); ->183.8

while 0 padded float division seams OK :
println(03456.0/10.0); -> 345.6

Even stranger with
println(08765/10);
giving following error:
unexpected token: 8765

Any reason for this amazing behavior ?

Though guicomponents GWindow widget is a Processing applet I don't see how to add
ordinary widgets (GSliders, ...) to a GWindow. Is it possible ? I don't see neither how
such widgets could operate from within GWinData.

Starting from P. Lager createWindow() method from his g4p_windowsstarter example I unsuccessfully
(and naively) tried several variants of the kind :

 public void createWindow(){
  int col;
 
  //GSlider sl; // ???
 
    col = (128 << 8) | 0xff000000;
    window = new GWindow(this, "Window", 130, 100, 200, 200,false,  JAVA2D);
    window.setBackground(col);
    window.addData(new MyWinData());
    window.addDrawHandler(this, "windowDraw");
    window.addMouseHandler(this, "windowMouse");
   
    //  following add is not allowed, can we circumvent this issue ????
    window.add(new GSlider(this,0,10,10,10,10));
}

Is there a trick to build GUIs in separate windows ? That's not mandatory but
usefull to understand what can be done with this lib.