C:\jexp>javac painttest.java
painttest.java:39: interface expected here
    class MouseMotionListener implements MouseMotionListener {
                                         ^
painttest.java:14: cannot resolve symbol
symbol  : class MouseMotionHandler
location: class PaintTest
        addMouseMotionListener(new MouseMotionHandler());
                                   ^
2 errors

  addMouseMotionListener(new [i]ClassName[/i]());

  class [i]ClassName[/i] implements MouseMotionListener {

  public void MouseMoved(MouseEvent e) {

//  <applet code="PaintTest" width="300" height="300"></applet>
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
 
public class PaintTest extends Applet {
    String str;
    Point prev, current;
 
    public void init() {
        str = "Initialized";
 
        addMouseMotionListener(new MotionHandler());
        addMouseListener(new MouseHandler());
        prev = new Point(0, 0);
        current = new Point(0, 0);
        showStatus("Initializing");
    }
 
    public void paint(Graphics g) {
        showStatus("Applet Painted");
    }
 
    //handler inner classes
 
    class MouseHandler extends MouseAdapter {
        public void mousePressed(MouseEvent e) {
            prev.x = e.getX();
            prev.y = e.getY();
        }
    }
 
    class MotionHandler extends MouseMotionAdapter {
        public void mouseDragged(MouseEvent e) {
            str = "Mouse Dragged";
            showStatus(str);
 
            current.x = e.getX();
            current.y = e.getY();
 
            Graphics g = getGraphics();
            g.setColor(Color.blue);
            g.drawLine(prev.x, prev.y, current.x, current.y);
 
            prev.x = current.x;
            prev.y = current.y;
        }
 
        public void mouseMoved(MouseEvent e) {
            str = "Mouse Moved";
            showStatus(str + " x = " + e.getX() + ", y = " + e.getY());
        }
    }
}