表盘式时钟，并显importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;importsun.util.calendar.Gregorian;importjava.util.Calendar;importjava.util.GregorianCalendar;publicclassClockextendsJFrameimplementsActionListener{intx,y,x0,y0,r,h,olds_x,olds_y,oldm_x,oldm_y,oldh_x,oldh_y,ss,mm