package manpowersystem;import java.util.*;import java.awt.*;import javax.swing.*;public class Clock extends JPanel implements Runnable {  boolean keepRunning=true;  int lastxs=0, lastys=0, lastxm=0, lastym=0, lastxh=0, lastyh=0;  Date dummy = new Date();  String lastdate = dummy.toLocaleString();  String myName;  public Clock(String inName) {     myName=new String(inName);  }  // Plotpoints allows calculation to only cover 45 degrees of the circle,  // and then mirrorpublic void plotpoints(int x0, int y0, int x, int y, Graphics g) {  g.drawLine(x0+x,y0+y,x0+x,y0+y);  g.drawLine(x0+y,y0+x,x0+y,y0+x);  g.drawLine(x0+y,y0-x,x0+y,y0-x);  g.drawLine(x0+x,y0-y,x0+x,y0-y);  g.drawLine(x0-x,y0-y,x0-x,y0-y);  g.drawLine(x0-y,y0-x,x0-y,y0-x);  g.drawLine(x0-y,y0+x,x0-y,y0+x);  g.drawLine(x0-x,y0+y,x0-x,y0+y);}  // Circle is just Bresenham's algorithm for a scan converted circlepublic void circle(int x0, int y0, int r, Graphics g) {  int x,y;  float d;  x=0;  y=r;  d=5/4-r;  plotpoints(x0,y0,x,y,g);  while (y>x){    if (d<0) {      d=d+2*x+3;      x++;    }    else {      d=d+2*(x-y)+5;      x++;      y--;    }    plotpoints(x0,y0,x,y,g);  }}  // Paint is the main part of the programpublic void paintComponent(Graphics g) {  super.paintComponent(g);  int xh, yh, xm, ym, xs, ys, s, m, h, xcenter, ycenter;  String today;  Date dat = new Date();  s = dat.getSeconds();  m = dat.getMinutes();  h = dat.getHours();  today = dat.toLocaleString();  xcenter=getWidth()/2;  ycenter=getHeight()/2-10;  // a= s* pi/2 - pi/2 (to switch 0,0 from 3:00 to 12:00)  // x = r(cos a) + xcenter, y = r(sin a) + ycenter  xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 35 + xcenter);  ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 35 + ycenter);  xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 30 + xcenter);  ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 30 + ycenter);  xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 20 + xcenter);  yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 20 + ycenter);  // Draw the circle and numbers  g.setFont(new Font("TimesRoman", Font.PLAIN, 14));  g.setColor(Color.green);  circle(xcenter,ycenter,40,g);  g.setColor(new Color(0,0,200));  g.drawString("9",xcenter-35,ycenter+3);  g.drawString("3",xcenter+30,ycenter+3);  g.drawString("12",xcenter-5,ycenter-27);  g.drawString("6",xcenter-3,ycenter+35);  // Erase if necessary, and redraw  g.setColor(Color.red);  if (xs != lastxs || ys != lastys) {    g.drawLine(xcenter, ycenter, lastxs, lastys);    g.drawString(lastdate,xcenter-55, ycenter+55);  }  if (xm != lastxm || ym != lastym) {    g.drawLine(xcenter, ycenter-1, lastxm, lastym);    g.drawLine(xcenter-1, ycenter, lastxm, lastym); }  if (xh != lastxh || yh != lastyh) {    g.drawLine(xcenter, ycenter-1, lastxh, lastyh);    g.drawLine(xcenter-1, ycenter, lastxh, lastyh); }  g.setColor(Color.red);  g.drawString(today, xcenter-55, ycenter+55);  g.drawLine(xcenter, ycenter, xs, ys);  g.setColor(Color.black);  g.drawLine(xcenter, ycenter-1, xm, ym);  g.drawLine(xcenter-1, ycenter, xm, ym);  g.drawLine(xcenter, ycenter-1, xh, yh);  g.drawLine(xcenter-1, ycenter, xh, yh);  lastxs=xs; lastys=ys;  lastxm=xm; lastym=ym;  lastxh=xh; lastyh=yh;  lastdate = today;}public void stop() {  keepRunning= false;}public void run() {  while (keepRunning) {    try {Thread.sleep(100);} catch (InterruptedException e){}    repaint();  }}}