How to read binary file into a 2D float array??

Question

Hi All,
I really need help to get this one as I am stuck and can't seem to find any way out of it. I am given a '.dat' file that has float values in it. I want to read this file in java and put it in a 2D float array. The file has basically a matrix of float values. What I want to do is to read this binary file and put all its data into 2D float array (float [] []) so that I can use it in my program. Is there a way to read file like this? I did find a similar matlab code (below) but cant seem to find anything in java and i really want to do this in java only.. I will appreciate ur help in this one.
thanks very much
Nitya
fid = fopen('datafile.dat');
A = fread(fid,[50 50],'float32');
fclose(fid);

Answer 1

I shud have shown the two ways that i Already tried. here they are..
first one using DataInputStream and then trying to readFloat()
DataInputStream dis = ....
Float f = dis.readFloat();This code gives code gives me some random values like this.. (i had a loop)
5.8758974E-14
-0.41055492
1.5724557E-30
1.06822824E14
-1.91934371E15
3.43829601E13
Other way i tried was this.. which seems right but here i have to convert byte to float and i thnk that code is giving some different results (slightly different float values) not sure why....may be my indexing of the array is wrong to make it a matrix.. or something else...
is.read(bytes, offset....);
int cnt = 0;
int j = 0;
for (int start = 0; start < offset; start = start + 4) {
  if(j<50){
       myarray[cnt][j] = this.arr2float(bytes, start);
         System.out.println(cnt + "-" + j + " = " + myarray[cnt][j]);
       j++;
}else{
  if(cnt < 50){
       cnt++;
       j = 0;
  }else{
       break;
public float arr2float (byte[] arr, int start) {
          int i = 0;
          int len = 4;
          int cnt = 0;
          byte[] tmp = new byte[len];
          for (i = start; i < (start + len); i++) {
               tmp[cnt] = arr;
               cnt++;
          int accum = 0;
          i = 0;
          for ( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) {
               accum |= ( (long)( tmp[i] & 0xff ) ) << shiftBy;
               i++;
          return Float.intBitsToFloat(accum);
Not sure if i am missing some other way to do this...