Swing - Need help reading and converting an array

Hey i don't know if anyone can help me. This is my first post so i don't know if you are supposed to post stuff like this without any code. I am writing part of the code for a car racing game. The problem is that i have to write a method that allows me to open "track" files to race on. The method needs to follow the instructions below

Each line in a track file has the format n*s where s is a shearOffset, and n is the number of sequential track segments that have the same shearOffset of s eg:
2*0.0
1*-1.0
2*0.0

- Use the Util.readFile() method to read the lines of the file into
an array.
For each line in the file:
- Use a string tokenizer to split the line into the two strings
- Convert the first string to an int, and the second string to a
double.
- Add an apropriate number of shear offsets to a
ShearOffsetsBuilder using the data from this line.
- After all lines are read, return an array containing all of the
shear offsets added to your ShearOffsetsBuilder.
This is what the ShearOffsetBuilder looks like.

private class ShearOffsetsBuilder
{
private List shearOffsetList;

public ShearOffsetsBuilder()
{
shearOffsetList = new ArrayList();
}

public void addShearOffset(double shearOffset)
{
shearOffsetList.add(new Double(shearOffset));
}

public double[] buildShearOffsets()
{
double[] shearOffsets = new double[shearOffsetList.size()];
for (int i = 0; i < shearOffsets.length; i++)
shearOffsets[i] = ((Double)shearOffsetList.get(i)).doubleValue();
return shearOffsets;
}
}

This is the Util.readFile method:
public static String[] readFile(File file)
{
try
{
List lineList = new ArrayList();
BufferedReader in = new BufferedReader(new FileReader(file));
String line;
while ((line = in.readLine()) != null)
lineList.add(line);
in.close();
String[] lineArray = new String[lineList.size()];
for (int i = 0; i < lineArray.length; i++)
lineArray[i] = (String)lineList.get(i);
return lineArray;
}
catch (IOException e)
{
return null;
}
}

Any help would be much appreciated

PS I know i am supposed to show what i have written so it can be seen what is wrong. This is what i have written so far. I'm fairly certain it is horribly wrong but be nice. I am very very new at this

private double[] loadShearOffsetsFromFile(File file)
{
String[] linesArray = Util.readFile(file);
if (linesArray == null)
{
return null;
}
else
{
for (int i = 0; i < linesArray.length; i++)
{
StringTokenizer st = new StringTokenizer(i);
String n = st.nextToken();
String s = st.nextToken();
int ni = Integer.parseInt(n);
int si = Integer.parseInt(s);
int nisi = ni*si;
ShearOffsetsBuilder build = new ShearOffsetsBuilder();
build.addShearOffset(nisi);
}
return null;


}
}

Welcome,

There's nothing wrong with posting code, in fact there are even special code tags to use.
Check out these links for more info:

As for your question, well, i didn't really see a question. Are you having an issue with something?

Sorry i guess i didn't make it very clear.
At the beginning of the first post i wrote is what i guess you could call pseudo code what i am supposed to be writing.
The second post is what i have written so far which i know is completely wrong. I really just don't have much of an idea how to start this method or particularly what to write in the foor loop for the string tokenizer.
cheers

You can start by modifying your post and wrapping your codes in java code tags. Lest for me it seems like I am looking at a black and white tv

oh ok sorry guys. ok i will try this again.
This is my mission should i choose to accept it and thus yours too if you are willing to spend the time:

Each line in a track file has the format n*s where s is a shearOffset, and n is the number of sequential track segments that have the same shearOffset of s eg:
2*0.0
1*-1.0
2*0.0

- Use the Util.readFile() method to read the lines of the file into
an array.
For each line in the file:
- Use a string tokenizer to split the line into the two strings
- Convert the first string to an int, and the second string to a
double.
- Add an apropriate number of shear offsets to a
ShearOffsetsBuilder using the data from this line.
- After all lines are read, return an array containing all of the
shear offsets added to your ShearOffsetsBuilder.

This is the Util.readFile() method:


The ShearOffsetsBuilder looks like this:



This is my code that i sort of gave up on out of frustration and just general lack of knowledge:


Now i understand you guys probably won't want to write the entire thing and i totall understand that. I was just hoping someone might just be able to put me on track. I am especially really confused as to what i need to send the string tokenizer in the first place
Thanks for your time