Either the caption or the text may be null, but an NullPointerException is thrown if both are null. When displayed, the caption or text strings may be truncated on some platforms; the number of characters that may be displayed is platform-dependent.
Note: Some platforms may not support showing a message.
@param caption the caption displayed above the text, usually inbold; may be null
@param text the text displayed for the particular message; may benull
@param messageType an enum indicating the message type
@throws NullPointerException if both captionand text are null
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