import java.applet.*;
               import java.awt.*;
               public class second extends Applet {
               private int lastx, lasty;    
               Button clear_button;         
               Graphics g;                  
              
               public void init() {
               clear_button = new Button("Clear");
               this.add(clear_button);
               g = this.getGraphics();
               }
              
               public boolean mouseDown(Event e, int x, int y) {
               lastx = x; lasty = y;
               return true;
               }
              
               public boolean mouseDrag(Event e, int x, int y) {
               g.setColor(Color.black) ;
               g.drawLine(lastx, lasty, x, y);
               lastx = x; lasty = y;
               return true;
               }
              
               public boolean keyDown(Event e, int key) {
               if ((e.id == Event.KEY_PRESS) && (key == 'c' ) ) {
               clear() ;
               return true;
               }
               else return false;
               }
              
               public boolean action(Event e, Object arg) {
               if (e.target == clear_button) {
               clear();
               return true;
               }
               else return false;
               }
              
               public void clear() {
               g.setColor(this.getBackground());
               g.fillRect(0, 0, bounds().width, bounds().height);
               } }