JDialog wrapping this centered on the parentComponent in the parentComponent's frame. title is the title of the returned dialog. The returned JDialog will not be resizable by the user, however programs can invoke setResizable on the JDialog instance to change this property. The returned JDialog will be set up such that once it is closed, or the user clicks on one of the buttons, the optionpane's value property will be set accordingly and the dialog will be closed. Each time the dialog is made visible, it will reset the option pane's value property to JOptionPane.UNINITIALIZED_VALUE to ensure the user's subsequent action closes the dialog properly.
@param parentComponent determines the frame in which the dialog is displayed; if the parentComponenthas no Frame, a default Frame is used
@param title the title string for the dialog
@return a new JDialog containing this instance
@throws HeadlessException if GraphicsEnvironment.isHeadless returns true
@see java.awt.GraphicsEnvironment#isHeadless
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