Compatibility issues with my applet and label color.

[Jos� Alberto Mu�iz Navarro]

Hi. I recently wrote an applet that is like a quiz. If you win, an animation appears. If you lose, another animation appears. Everything works fine with my appletviewer (Running Java2 SDK 1.4.2). However, I have the following problems running my applet on other computers:
* MacOS X - The applet is displayed but instead of the animation a black square appears in the place where the animation should appear.
* Windows XP - The applet is not displayed at all. An exception appears. I am not in the computer right now so I will post the error in a minute. However, I read somewhere else that Java VM under Windows is unable to display applets run locally because there is some problem to access files from a location like file://. According to them, the only solutions are either to get appletviewer or install a server there to get the applet to run as localhost/applet.htm. Is this true?
Also... is there a way to change the color of labels and checkboxes? Thanks a lot for your time
My code goes here:

import java.awt.*;
import java.applet.Applet;
public class MainApplet extends Applet implements Runnable {
    /* Determines some values to show what kind of animation should
     * be shown
     */
    DataObtainer questions = new DataObtainer();
    int deadMen = 0;
    int savedMen = 0;
    final int RIGHT = 0;
    final int WRONG = 1;
    final int NOCHOICE = -1;
    final int MAXWIDTH = 107;
    final int MAXHEIGHT = 52;
    int animationType = -2;
    int errorHandler = -5;
    /* Image management goes here */
    boolean animate = false;
    boolean errorDisplayer = true;
    Image buffer = null;
    Image laogai = null;
    Image[] rightArray= new Image[86];
    Image[] wrongArray= new Image[77];
    Graphics gContext;
    MediaTracker rightObserver = new MediaTracker(this);
    MediaTracker wrongObserver = new MediaTracker(this);
    Thread animations = null;
    /* Label where the questions will be appearing and where the
     * results will be published
     */
    Label question;
    Label results;
    boolean finished = false;
    /* Set of possible answers for user to decide */
    Checkbox answerA;
    Checkbox answerB;
    Checkbox answerC;
    Checkbox answerD;
    /* Button to publish results */
    Button answer;
    /* Group of answers so that only one can be selected */
    CheckboxGroup answers;
    public void init() {
setBackground(Color.white);
setSize(1000, 300);
setLayout(null);

/* Initialitation of images */
for (int i = 0; i < 77; i++)
{
wrongArray[i] = getImage(getCodeBase(),
"Images/Wrong/walking" + (i + 1) + ".gif");
wrongObserver.addImage(wrongArray[i], i);
}
for (int i = 0; i < 86; i++)
{
rightArray[i] = getImage(getCodeBase(),
"Images/Right/walking" + (i + 1) + ".gif");
rightObserver.addImage(rightArray[i], i);
}
laogai = getImage(getCodeBase(), "Images/laogai.gif");
/* Creation of a blank space */
buffer = createImage(MAXWIDTH, MAXHEIGHT);
gContext = buffer.getGraphics();
gContext.setColor(Color.white);
gContext.fillRect(0, 0, MAXWIDTH, MAXHEIGHT);
        /* Initizalization of Button, Labels and Checkboxes */
        question = new Label(questions.getQuestion());
        results = new Label("Killed Chinese Slaves: " + deadMen +
    "          |           Saved Chinese Slaves: " + savedMen,
     Label.CENTER);
        answers = new CheckboxGroup();
String answerTexts[] = questions.getShuffledAnswerSet();
        answerA = new Checkbox(answerTexts[0], answers, false);
        answerB = new Checkbox(answerTexts[1], answers, false);
        answerC = new Checkbox(answerTexts[2], answers, false);
        answerD = new Checkbox(answerTexts[3], answers, false);
answer = new Button("Answer!");

/* Collocation of components */
results.setBounds(2, 2, this.getWidth() - 4, 50);
question.setBounds(15, 60, 550, 50);
answerA.setBounds(15, 125, 550, 20);
answerB.setBounds(15, 150, 550, 20);
answerC.setBounds(15, 175, 550, 20);
answerD.setBounds(15, 200, 550, 20);
answer.setBounds((answerA.getWidth() - 70 ) / 2, 225 , 70, 35);
add(results);
add(question);
add(answerA);
add(answerB);
add(answerC);
add(answerD);
add(answer);
try {
rightObserver.waitForAll();
wrongObserver.waitForAll();
}
catch (Exception e) {}

    }
    public boolean action(Event e, Object o)
    {
    if (e.target == answer)
{
if (answerA.getState() || answerB.getState() || answerC.getState() || answerD.getState())
{

animationType = (int) (Math.random() * 1);
if (answerA.getState() &&
    questions.getCorrectAnswer().equals(answerA.getLabel()))
animationType = RIGHT;
else if (answerB.getState() &&   questions.getCorrectAnswer().equals(answerB.getLabel()))
animationType = RIGHT;
else if (answerC.getState() &&
 questions.getCorrectAnswer().equals(answerC.getLabel()))
animationType = RIGHT;
else if (answerD.getState() &&
 questions.getCorrectAnswer().equals(answerD.getLabel()))
animationType = RIGHT;
else
animationType = WRONG;
animations = new Thread(this);
animate = true;
animations.start();
answer.setEnabled(false);
if (animationType == RIGHT)
{
questions.ShuffleQuestions();
question.setText(questions.getQuestion());
String answerTexts [] = questions.getShuffledAnswerSet();
answerA.setLabel(answerTexts[0]);
answerB.setLabel(answerTexts[1]);
answerC.setLabel(answerTexts[2]);
answerD.setLabel(answerTexts[3]);
        results.setText("Killed Chinese Slaves: " + deadMen + "          |           Saved Chinese Slaves: " + ++savedMen);
}
else
results.setText("Killed Chinese Slaves: " + ++deadMen + "          |           Saved Chinese Slaves: " + savedMen);

}
else
{
errorHandler = NOCHOICE;
repaint();
}
answerA.setState(false);
answerB.setState(false);
answerC.setState(false);
answerD.setState(false);
}
return true;
    }
    public void paint(Graphics g) {
    if (animate)
{
g.drawImage(buffer, (460 + laogai.getWidth(this)), 250 , this);
}
else if (errorHandler == NOCHOICE)
{
g.setColor(Color.red);
g.drawString("No answer selected", 15, 235);
answer.setEnabled(false);
try {
Thread.sleep(1000);
}
catch (Exception e) {}
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(Color.black);
answer.setEnabled(true);
errorHandler = -5;
}
if (animationType == WRONG && errorDisplayer)
{
g.setColor(Color.red);
g.drawString("ERROR!! Try again. ", 15, 235);
g.drawString("A Chinese will be killed", 15, 255);
answer.setEnabled(false);
g.setColor(Color.black);
if (finished)
{
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(Color.black);
answer.setEnabled(true);
finished = false;
errorDisplayer = false;
}

}
g.drawImage(laogai, 570, 45, this);
g.drawRect(0, 0, this.getWidth() - 2, 52);
    }

    public void run()
    {
if (animationType == RIGHT)
{
for (int i = 0; i < 86; i++)
{
gContext.clearRect(0, 0, buffer.getWidth(this), buffer.getHeight(this));
gContext.drawImage(rightArray[i], 0, 0, this);
try {
Thread.sleep(100);
}
catch(Exception e) {}
repaint();
}
gContext.clearRect(0, 0, buffer.getWidth(this), buffer.getHeight(this));
repaint();
animate = false;
}
else if (animationType == WRONG)
{
errorDisplayer = true;
for (int i = 0; i < 77; i++)
{
gContext.clearRect(0, 0, buffer.getWidth(this), buffer.getHeight(this));
gContext.drawImage(wrongArray[i], 0, 0, this);
try {
Thread.sleep(70);
}
catch(Exception e) {}
repaint();
}
gContext.clearRect(0, 0, buffer.getWidth(this), buffer.getHeight(this));
finished = true;
repaint();
animate = false;
}
answer.setEnabled(true);
gContext.setColor(Color.white);
gContext.fillRect(0, 0, MAXWIDTH, MAXHEIGHT);
animations = null;
    }
    public void update(Graphics g)
    {
    paint(g);
    }
}

class DataObtainer
{
private String questionArray[] = { "What does laogai mean?",//1
   "How does China ensure trade even when against the Memorandum of Understanding?", //20
   "Has China ratified the Convention Against Torture (CAT) ?", //21
   "Who is the leader of the Laogai Research Foundation?"};//22
/* Four answers for each question. First one should be the real one */
private String answerArray[] =  { "Reform through labor",
  "Concentration Camp",
  "Chinese sushi",
  "Reeducation Camps",
[...] 
//20
"Manipulation of Image of Labor Camps",
"Signed Treaties not respected",
"Distribution of propaganda",
"None",
//21
"Part of it",
"No",
"Yes",
"I don't know",
//22
"Harry Hu",
"Den Xiaoping",
"Mao Zedong",
"Ronald W. Richardson" };
private String currentQuestion = "";
private String currentUnshuffledAnswerSet[] = new String[4];
private String correctAnswer = null;
private int index;
public void ShuffleQuestions()
{
// Random number between 0 and question number - 1
index = (int) (Math.random()  * questionArray.length);
currentQuestion = questionArray[index];
for (int i = 0; i < 4; i++)
currentUnshuffledAnswerSet[i] = answerArray[(index * 4) + i];
correctAnswer = currentUnshuffledAnswerSet[0];
}
public DataObtainer()
{
ShuffleQuestions();
}

public String getQuestion()
{
return currentQuestion;
}
public String[] getShuffledAnswerSet()
{
String currentShuffledAnswerSet[] = new String[4];
String buffer;
int number;
currentShuffledAnswerSet = currentUnshuffledAnswerSet;
for (int i = 0; i < 12; i++)
{
number = (int) (Math.random() * 4);
buffer = currentShuffledAnswerSet[number];
currentShuffledAnswerSet[number] = currentShuffledAnswerSet[i % 4];
currentShuffledAnswerSet[i % 4] = buffer;
}
return currentShuffledAnswerSet;
}
public String getCorrectAnswer()
{
return correctAnswer;
}
}