Java Reference
In-Depth Information
to fahrenheit");
btnConvertToFahrenheit.addActionListener(al);
pnlLayout.add(btnConvertToFahrenheit);
add(pnlLayout);
pack();
setResizable(false);
setVisible(true);
}
public static void main(String[] args)
{
Runnable r = new Runnable()
{
@Override
public void run()
{
new TempVerter();
}
};
EventQueue.invokeLater(r);
}
}
Followingseveralimportstatements,
Listing7-1
presentsthetemperature-conversion
application's
TempVerter
class,whichextendsthe
Frame
classtodescribeaframe
window that displays the GUI.
TempVerter
declares a noargument constructor for constructing the GUI. Its
main()
methodinstantiates
TempVerter
andinvokesitsnoargumentconstructorto
create the GUI.
main()
does not directly execute
new TempVerter();
. Doing so would con-
struct the GUI on the main thread. Instead,
main()
defers GUI creation to a special
AWT thread known as the
event-dispatch thread (EDT)
. It does so by creating a
java.lang.Runnable
instancewhose
run()
methodexecutes
new TempVert-
er();
, and by passing this runnable to the
java.awt.EventQueue
class's
void
invokeLater(Runnable runnable)
classmethod,whichexecutestherunnable
on the EDT.
