Memory problem reading CSV to array

Question

I've written a CSV reader in order to read training and test data into an array of arrays. Now the way I'm doing it I use stringTokenizer to return a string array of the csv file then convert that to a float array. When I convert the string to a float I make the string null, I hoped that would keep the memory down but when I get to files of about 65000 rows and 20 columns it runs out of memory. I'm sure this can be solved by increasing the heap size but I just found the whole float to string to float a little inefficient. My questions is this; is there are better way to convert a csv of floats into an array of floats, ie without first converting it to a string and then back to a float?
Error:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
     at InputTokenizer.csvReader(InputTokenizer.java:33)
     at run.main(run.java:49)
import java.io.*;
import java.util.*;
public class InputTokenizer {
     public String[][] numbers;
     float[][] floatInputs;
     public float[][] csvReader(String fileLocation, int numRows, int numCols){
          File file = new File(fileLocation);
          numbers = new String[numRows][numCols];
          String line = null;
          int row = 0;
          int col = 0;
          try{
               BufferedReader bufRdr = new BufferedReader(new FileReader(file));
               while((line = bufRdr.readLine()) != null)
                    StringTokenizer st = new StringTokenizer(line,";");
                    while (st.hasMoreTokens())
                         //get next token and store it in the array
                         numbers[row][col] = st.nextToken();
                         col++;
               row++;
               col=0;
               float[][] floatInputs = new float[numRows][numCols];
               for(int i=0; i<numCols;i++){
                  for(int j=0;j<numRows;j++){
                       Float buffer = new Float(numbers[i][j]);
                       numbers[i][j] =null;
                       floatInputs[i][j] = buffer;
          catch(Exception e)
               System.out.println("Exception while reading csv file: " + e);
          return floatInputs;
}

Answer 1

Stupid questions, changed the code to this and it seems to work = )
import java.io.*;
import java.util.*;
public class InputTokenizer {
     float[][] floatInputs;
     public float[][] csvReader(String fileLocation, int numRows, int numCols){
          File file = new File(fileLocation);
          floatInputs = new float[numRows][numCols];
          String line = null;
          int row = 0;
          int col = 0;
          try{
               BufferedReader bufRdr = new BufferedReader(new FileReader(file));
               while((line = bufRdr.readLine()) != null)
                    StringTokenizer st = new StringTokenizer(line,";");
                    while (st.hasMoreTokens())
                         //get next token and store it in the array
                         floatInputs[row][col] = new Float(st.nextToken());
                         col++;
               row++;
               col=0;
          catch(Exception e)
               System.out.println("Exception while reading csv file: " + e);
          return floatInputs;
}