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Object message?

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Subject	Object message?
From	bob smith <bob@coolfone.comze.com>
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Can someone tell me why "message" is an Object here in javax.swing.JOptionPane?

Why isn't it a String?

showMessageDialog
public static void showMessageDialog(Component parentComponent,
                                     Object message)
                              throws HeadlessException
Brings up an information-message dialog titled "Message".

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Object message? bob smith <bob@coolfone.comze.com> - 2012-10-08 12:52 -0700
  Re: Object message? Arne Vajhøj <arne@vajhoej.dk> - 2012-10-08 15:58 -0400
  Re: Object message? Knute Johnson <nospam@knutejohnson.com> - 2012-10-08 13:00 -0700
  Re: Object message? Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-08 16:13 -0400
  Re: Object message? Roedy Green <see_website@mindprod.com.invalid> - 2012-10-09 02:11 -0700
    Re: Object message? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-10-09 23:46 +0200
      Re: Object message? Lew <lewbloch@gmail.com> - 2012-10-09 16:01 -0700

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