I got this code sample from the internet, http://richardbowles.tripod.com/java/menu.htm was able to change the deprecated code to BufferedReader to read in the file, but don't know what's wrong with the errors I'm getting. This is sample code I'm trying to get to work so I can step through with a debugger and see how it works for my own combination multiple choice true false quiz. The author mentions downloading the .txt file, but I can't find it on the site. I used the format shown to make mine. ...maybe that's the problem? Or maybe
We only do command window, no gui for our assignments, and don't read in or write to files, but I want to check this out and shoot for some extra credit on mine.
If you can explain whats going on with these errors I would greatly appreciate it. I've googled for a while, but I'm getting nowhere, and I don't see anything wrong around the lines mentioned.
As always, any help would be greatly appreciated.
//The errors are
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at bioquiz.load(bioquiz.java:111)
at bioquiz.init(bioquiz.java:84)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
//the code is
//
import java.awt.*;
import java.applet.*;
import java.io.*;
import java.net.*;
import java.util.*;
public class bioquiz extends Applet
{ // This variable holds the user's score
private int score = 0;
private int mode = 0; // 0 = answering questions, 1 = viewing results
private int current = 0; // Current question being viewed
private final int numQuestions = 22;
private String[] questions;
private String[] possible1, possible2, possible3, possible4;
private String[] revise;
private int[] choice, correct;
static final Font textFont=new Font("Helvetica", Font.PLAIN, 14);
private Button nextButton, prevButton, finished;
private Button opt1, opt2, opt3, opt4;
private TextField t1, t2, t3, t4;
private TextArea quest;
private Panel top;
public void init()
{ setBackground(Color.cyan);
setFont(textFont);
prevButton = new Button("Previous Question");
finished = new Button("Finished");
nextButton = new Button("Next Question");
top = new Panel();
top.add(prevButton);
top.add(finished);
top.add(nextButton);
add("North", top);
opt1 = new Button("1");
opt2 = new Button("2");
opt3 = new Button("3");
opt4 = new Button("4");
quest = new TextArea(3,35);
quest.setEditable(false);
quest.setFont(textFont);
// quest.setWrap(true);
t1 = new TextField(31);
t1.setEditable(false);
t1.setFont(textFont);
t2 = new TextField(31);
t2.setFont(textFont);
t2.setEditable(false);
t3 = new TextField(31);
t3.setEditable(false);
t3.setFont(textFont);
t4 = new TextField(31);
t4.setEditable(false);
t4.setFont(textFont);
add(quest);
add(opt1);
add(t1);
add(opt2);
add(t2);
add(opt3);
add(t3);
add(opt4);
add(t4);
questions = new String[numQuestions];
possible1 = new String[numQuestions];
possible2 = new String[numQuestions];
possible3 = new String[numQuestions];
possible4 = new String[numQuestions];
revise = new String[numQuestions];
correct = new int[numQuestions];
choice = new int[numQuestions];
load();
}
// Load text into the text area from a file
public void load ()
{ URL whereAmI = getCodeBase();
String temp_s = whereAmI.toString();
String temp2 = temp_s + "biotext.txt";
String fileName;
// If this program is running from a hard disc (as opposed to the web)
// then the file name will start with "file:/" which the DataInputStream
// can't seem to cope with, so remove it.
if (temp2.startsWith("file:/") == true)
fileName = temp2.substring(6,temp2.length());
else
fileName = temp2; // Otherwise just copy string straight
try
{
BufferedReader f = new BufferedReader(new FileReader(fileName));
String line;
for (int i = 0; i < numQuestions; i++)
{ questions[i] = f.readLine();
possible1[i] = f.readLine();
possible2[i] = f.readLine();
possible3[i] = f.readLine();
possible4[i] = f.readLine();
correct[i] = Integer.parseInt(f.readLine());
revise[i] = f.readLine();
}
f.close();
}
catch (IOException e)
{ System.err.println("Error in file " + fileName + ": " + e.toString());
System.exit(1);
}
}
public void paint (Graphics g)
{ quest.setText(questions[current]);
wordWrap(40);
t1.setText(possible1[current]);
t2.setText(possible2[current]);
t3.setText(possible3[current]);
t4.setText(possible4[current]);
if (choice[current] != 0)
g.drawString("You chose: "+choice[current],10,245);
if (mode == 1)
{ if (choice[current] == 0)
g.drawString("You gave no answer.",10,245);
g.drawString("The correct answer was "+correct[current],150,245);
if (choice[current] == correct[current])
g.drawString("You got this one correct.",10,270);
else
g.drawString("You should revise " + revise[current] + ".",5,270);
g.drawString("Your score is " + score + " out of " + numQuestions,10,300);
}
}
public boolean action (Event e, Object arg)
{ if (e.target == prevButton && current > 0)
{ current--;
repaint();
}
if (e.target == finished)
{ mode = 1; // Indicates no more answers can be added
// Now determine the score
score = 0;
for (int i = 0; i < numQuestions; i++)
if (choice[i] == correct[i])
score++;
repaint();
}
if (e.target == nextButton && current < numQuestions-1)
{ current++;
repaint();
}
if (e.target == opt1 && mode == 0)
{ choice[current] = 1;
repaint();
}
if (e.target == opt2 && mode == 0)
{ choice[current] = 2;
repaint();
}
if (e.target == opt3 && mode == 0)
{ choice[current] = 3;
repaint();
}
if (e.target == opt4 && mode == 0)
{ choice[current] = 4;
repaint();
}
return true;
}
// Method that word wraps the text in the text area 'quest'.
// The width of the field is passed as a parameter
public void wordWrap(int width)
{ String s = quest.getText(); // Copy text into 's' ready to be decimated
StringTokenizer temp = new StringTokenizer(s," "); // Sets up tokenized version of text;
String s2 = ""; // Adapted version of string , with \n characters, built up here
int colCount = 0; // Count columns since start of string or since last \n character
int current_s2_length = 0; // Length of s2 up to last \n character
while (temp.hasMoreTokens())
{ String nextWd = temp.nextToken(); // Get next word from tokenized text
if (colCount + 1 + nextWd.length() < width)
{ s2 = s2 + " " + nextWd; // If not run out of room, add word on end
colCount = s2.length() - current_s2_length;;
}
else
{ s2 = s2 + "\n" + nextWd; // Otherwise move to next line
current_s2_length = s2.length() - nextWd.length();
colCount = nextWd.length(); // New column count is number of chars on next line
}
}
quest.setText(s2.trim()); // Copy the text back into the text area
}
}
// my text file is named biotext.txt and saved in my bin project file in Ecliplse.
Who wrote Beethoven's Fifth Symphony?
Mozart
Shostakovitch
Beethoven
Schubert
3
Classical music
Who wrote Beethoven's sixth Symphony?
Brahms
Taichofsky
Beethoven
Bach
3
Classical music
