Reading from File and Storing in Array

I have a file with one floating point number per line which I have to
read into an array. I wrote a piece of code using the String Tokenizer
but it tries to tokenize the file name itself instead of the file
contents. I'm VERY new to this so please don't make fun :-P Please help
or at least point in the right direction. Thank you.

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import java.io.*;
import java.util.*;
import javax.swing.JOptionPane;

public class FileReader
{
    /* Main Method */
    public static void main(String[] args)
    {
        FileReader input = null;

        // Promt the user for file name
        String fileName = JOptionPane.showInputDialog(null,
            "Enter the file name:",
            "File Name Prompt",
            JOptionPane.QUESTION_MESSAGE);

        // Create a file object
        File file = new File(fileName);

        try
        {
            // Create an input stream
            input = new FileReader(fileName);

            int code;

            // Repeatedly read a character and display it on the console
            while((code = input.read()) != -1)
                System.out.print((char)code);
        }

        catch (FileNotFoundException ex)
        {
            System.out.println("File " + fileName + " does not exist.\n");
        }

        catch (IOException ex)
        {
            ex.printStackTrace();
        }

        finally
        {
            try
            {
                // Close the file
                input.close();
            }

            catch(IOException ex)
            {
                ex.printStackTrace();
            }
        }

        // Tokenizer doesn't work because it's reading the file name string
        // instead of the file contents.

        StringTokenizer tokenizer = new StringTokenizer(fileName, "\n");

        System.out.println("The total number of tokens is " +
        tokenizer.countTokens());

        while (tokenizer.hasMoreTokens())
        {
            System.out.println(tokenizer.nextToken());
        }
    }
}
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