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I made a Applet...

1 reply on 1 page. Most recent reply: Nov 19, 2002 9:43 AM by Matt Gerrans

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guy

Posts: 4
Nickname: guy123123
Registered: Nov, 2002

I made a Applet...

Posted: Nov 19, 2002 8:09 AM

My Applet wont work. When i hit the buttons i get this
Exception occured during event dispatching:
java.lang.NullPointerException:
then a long list of errors i guess...

this happens when i click the 2 buttons i made. i dont know why they dont work. Heres my code

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

public class EApplet extends Applet implements ActionListener
{
private Button keysArray[];
private Panel keyPad;
private TextField lcdField;
private TextField QuestionField;
private Label ScoreLabel;
private int Score;
private int i;
private String Questions[];
private int Answers[];
private boolean foundKey;

public void init()
{
foundKey = false;
int i = 1;
int[] Answers = new int[5];
String[] Questions = new String[5];
Questions[1] = "A Tomato is a vegetable.";
Answers[1] = 0;
Questions[2] = "You love this game.";
Answers[2] = 1;
Questions[3] = "Troy is an Idiot!";
Answers[3] = 1;
Questions[4] = "The sun is warm.";
Answers[4] = 1;
lcdField = new TextField(20);
QuestionField = new TextField(20);

ScoreLabel = new Label("0");
Score = 0;

keyPad = new Panel();
keysArray = new Button[3];

setLayout(new BorderLayout());

lcdField.setEditable(false);
QuestionField.setEditable(false);

keysArray[1] = new Button("YES");

keysArray[2] = new Button("NO");

keyPad.setLayout(new GridLayout(1,2));

keyPad.add(keysArray[1]);
keyPad.add(keysArray[2]);

add(lcdField, BorderLayout.NORTH);
add(QuestionField, BorderLayout.SOUTH);
add(ScoreLabel, BorderLayout.EAST);
add(keyPad, BorderLayout.CENTER);
QuestionField.setText(" " + (Questions));

keysArray[1].addActionListener(this);

keysArray[2].addActionListener(this);
i = 0;

}
public void actionPerformed(ActionEvent e)
{
while(i!=5)
{

i = i + 1;

foundKey = false;

QuestionField.setText(""+Questions);

if(e.getSource() == keysArray[1])
{
foundKey = true;

if(Answers == 1)
{

lcdField.setText("You are Correct!!");
Score += 1;
ScoreLabel.setText(" " + (Score));
}
if(Answers == 0)
{

Score -= 1;
ScoreLabel.setText(" " + (Score));
lcdField.setText("You are Incorrect!!");
}
}
if(e.getSource() == keysArray[2])
{

lcdField.setText(""+(Answers));
foundKey = true;

if(Answers == 0)
{

lcdField.setText("You are Correct!!");
Score += 1;
ScoreLabel.setText(" " + (Score));
}
if(Answers == 1)
{

Score -= 1;
ScoreLabel.setText(" " + (Score));
lcdField.setText("You are Incorrect!!");
}
}

}
if(Score == 4)
{
lcdField.setText("You WIN!!!");
}
else
{
lcdField.setText("You lose...");
}
}

}

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: I made a Applet...

Posted: Nov 19, 2002 9:43 AM

I don't even believe this thing will compile, since you have stuff like "if(Answers == 0)" where Answers is an array.

By the way, if you use the java tag when you post, the code will be a lot more readable (see "Formatting Your Post" in the box on the right, when you are composing the post).

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