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Ranch Hand
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The Container methods add( Component comp ) and add( String name, Component comp ) will throw an IllegalArgumentException
if comp is a:
a) button
b) list
c) window
d) textarea
e) container that contains this container

c,e is answer but i don't know why???
 
Wanderer
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C - Window is described in API as a top-level container - it cannot be inside another container.
E - Take an envelope. Place envelope inside itself. If you can do this, tell us how, and we can write to Sun and tell them how they can implement a Container which contains itself.
 
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