Container

[Anonymous]

which of the following cannot be added to a container
(a)applet (b)container (c)menu item (d)panel (e)component
Pls help

[Aru]

Choi,
Container & menu Item can't be added to a container.
Aruna

[Sarada Bhasker]

a container can be added to a container. for eg panel and frame are containers. panel can be added to a frame. Only menu Item cannot be added to a container. It can be added only to a menu.

[Mapraputa Is]

a container C1 can be added to a container C2 if
1) C1 is not a window or its descendants
2) C1 is not a C2's parent
or IllegalArgumentException will be thrown
All overloaded versions of Container's add() method merely call addImpl method, whose comments said:

/* Check for correct arguments: index in bounds,
* comp cannot be one of this container's parents,
* and comp cannot be a window.
*/

here is part of addImpl code:

    if (comp instanceof Container) {
for (Container cn = this; cn != null; cn=cn.parent) {
    if (cn == comp) {
throw new IllegalArgumentException(
  "adding container's parent to itself");
    }
}
    }
    if (comp instanceof Window) {
        throw new IllegalArgumentException(
     "adding a window to a container");
    }

[This message has been edited by Mapraputa Is (edited September 25, 2000).]