java - JOptionPane window opens in background -
i developing swing application, little query joptionpane.showmessagedialog()
bugging me:
joptionpane.showmessagedialog(null, "record entered successfully");
if write code message window appears @ of parent frame.joptionpane.showmessagedialog(this, "record entered successfully");
whereas code automatically places window on parent frame.
the question is: while implementing null
first argument message @ background of current parent frame whereas if write this
first argument window comes on parent frame. why happenning?
in method
showmessagedialog(component parentcomponent, object message)
the first argument sets parent of dialog:
parentcomponent
defines component parent of dialog box. used in 2 ways: frame contains used frame parent dialog box, , screen coordinates used in placement of dialog box. in general, dialog box placed below component. parameter may
null
, in case default frame used parent, , dialog centered on screen (depending on l&f).
i assume method appears inside jframe
class, in case passing this
argument set parent component frame.
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