How to repaint a Jlabel after certain gap of time again and again in java netbeans ide?

-i am making a clock in java that displays current time in a jlabel but that event fire up only with mousemotion and the label keeps on updating if the mouse is kept moving.how do i automatically update time in the label after a gap of 1sec each.

am using loop,sleep,repaint to do it but it is still not working.