Please Help Me I am stoped at this point

Question

I am a beginner here is my simple code:
import java.awt.*;
public class RootApplet extends com.sun.java.swing.JApplet {
     int number;
     public void init() {
          number = 225;
     public void paint(Graphics screen) {
          super.paint (screen);
     Graphics2D screen2D = (Graphics2D) screen;
     screen2D.drawString("The square root of " +
          number +
          " is " +
          Math.sqrt(number), 5, 50);
when i try to compile I recieve this error:
C:\jdk1.2.2\J24Work>javac RootApplet.java
RootApplet.java:3: Superclass com.sun.java.swing.JApplet of class RootApplet not
found.
public class RootApplet extends com.sun.java.swing.JApplet {
^
1 error
It would be highly appriciated if you help me as i am stoped at this point.thank you

Answer 1

You are extending the wrong class. In general, it is not a good idea to extend any of Sun's own classes. (There may be redistribution issues, and at the very least, your users will have to install the entire SDK rather than a JRE).
Extend javax.swing.JApplet instead.
- Saish