package lineupdate;import java.awt.*;import java.awt.event.*;import java.applet.*;public class update extends Applet {  boolean flag ;  boolean drawing ;  Point spoint;  Point epoint;  boolean isStandalone = false;  /**Get a parameter value*/  public String getParameter(String key, String def) {    return isStandalone ? System.getProperty(key, def) :      (getParameter(key) != null ? getParameter(key) : def);  }  /**Construct the applet*/  public update() {  }  /**Initialize the applet*/  public void init() {    flag = false;    drawing = false;    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception {    this.addMouseListener(new java.awt.event.MouseAdapter() {      public void mouseClicked(MouseEvent e) {        this_mouseClicked(e);      }    });    this.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {      public void mouseMoved(MouseEvent e) {        this_mouseMoved(e);      }    });  }  /**Get Applet information*/  public String getAppletInfo() {    return "Applet Information";  }  /**Get parameter info*/  public String[][] getParameterInfo() {    return null;  }  void this_mouseMoved(MouseEvent e) {     if (flag){         spoint = new Point(e.getX(),e.getY());         flag = !flag;     }     else{         epoint = new Point(e.getX(),e.getY());         flag = !flag;     }     repaint();  }  void this_mouseClicked(MouseEvent e) {      drawing = true;      spoint = new Point(e.getX(),e.getY());  }  public void paint(Graphics g){      if(drawing){         g.drawLine(spoint.x,spoint.y,epoint.x,epoint.y);      }  }  public void update(Graphics g){      paint(g);  }  }