class F1 extends JFrame { private Object tonObject = null; public Object getTonObject(){return tonObject;} } class F2 extends JFrame { private Object object = null; private JFrame taRef = null; public F2( JFrame frame ) { setTaRef( frame);} private void taMethode() { if ( taRef != null) { taRef.setvisible(true); // ;o) } } public setTaRef( JFrame frm ) { taRef = frm; } }