java.lang.Object
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+----java.awt.Component
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+----java.awt.Container
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+----java.awt.Window
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+----java.awt.Dialog
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+----java.awt.FileDialog
public class FileDialog
extends Dialog
The FileDialog class displays a dialog window from which the user can select a file.
Since it is a modal dialog, when the application calls its show method to display the dialog, it blocks the rest of the application until the user has chosen a file.