Display.getDefualt.syncExec
Causes the <code>run()</code> method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity. The caller of this method continues to run in parallel, and is not notified when the runnable has completed. Specifying <code>null</code> as the runnable simply wakes the user-interface thread when run.Note that at the time the runnable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is necessary to check for this case inside the runnable before accessing the widget.
Display.getDefault.asysnExec(Runnable)
Causes the <code>run()</code> method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity. The thread which calls this method is suspended until the runnable completes. Specifying <code>null</code> as the runnable simply wakes the user-interface thread.
Note that at the time the runnable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is necessary to check for this case inside the runnable before accessing the widget.
Display.getDefault.sysnExec(Runnable)