java applet's

[code]
import java.awt.*;

class Dot
{
int left, top;
Color color;
String labl;
Font fnt;

Dot(String lbl, int l, int t, Color c, Font f)
{
labl = lbl;
left = l;
top = t;
color = c;
fnt = f;
}
public int widthOf() { return 0; }
public int heightOf() { return 0; }
public void setWidth(int w) {}
public void setHeight(int h) {}
public void setLabel(String s) { labl = s; }
public void setLeft(int l) { left = l; }
public void setTop(int t) { top = t; }
public void setColor(Color c) { color = c; }
public int leftOf() { return left; }
public int topOf() { return top; }
public Color colorOf() { return color; }
public String labelOf() { return labl; }
public void draw (Graphics q) {}
public boolean find (int x, int y) { return false; }
public void setFont(Font f) { fnt = f; }
public Font getFont() { return fnt; }
}

class RectDot extends Dot
{
int width, height;

RectDot (String s, int l, int t, int w, int h, Color c, Font f)
{
super(s,l,t,c,f);
width = w;
height = h;
}
public int widthOf() { return width; }
public int heightOf() { return height; }
public void setWidth(int w) { width = w; }
public void setHeight(int h) { height = h; }
public boolean find(int x, int y)
{
if (super.leftOf() < x && x < super.leftOf()+width &&
super.topOf() < y && y < super.topOf()+height)
return true;
return false;
}
public void draw(Graphics g)
{
g.setFont(super.getFont());
int w = 20;
int h = 10;
g.setColor(colorOf());
g.fillRect(leftOf(), topOf(), width, height);
g.setColor(Color.black);
g.drawString(labl, leftOf()-w/2+width/2, topOf()+h/4+height/2);
}
}

class OvalDot extends Dot
{
int width, height;

OvalDot (String s, int l, int t, int w, int h, Color c, Font f)
{
super(s,l,t,c,f);
width = w;
height = h;
}

public int widthOf() { return width; }
public int heightOf() { return height; }
public void setWidth(int w) { width = w; }
public void setHeight(int h) { height = h; }

public boolean find(int x, int y)
{
if (super.leftOf() < x && x < super.leftOf()+width &&
super.topOf() < y && y < super.topOf()+height)
return true;
return false;
}

public void draw(Graphics g)
{
g.setFont(super.getFont());
int w = 20;
int h = 10;
g.setColor(colorOf());
g.fillOval(leftOf(), topOf(), width, height);
g.setColor(Color.black);
g.drawString(labl, leftOf()-w/2+width/2, topOf()+h/4+height/2);
}
}

class CircDot extends Dot
{
int diam;

CircDot (String s, int l, int t, int d, Color c, Font f)
{
super(s,l,t,c,f);
diam = d;
}

public int widthOf() { return diam; }
public int heightOf() { return diam; }
public int diameterOf() { return diam; }
public void setWidth(int w) { diam = w; }
public void setHeight(int h) { diam = h; }
public void setDiam(int d) { diam = d; }

public boolean find (int x, int y)
{
if (super.leftOf() < x && x < super.leftOf()+diam &&
super.topOf() < y && y < super.topOf()+diam)
return true;
return false;
}