Writing binary data in same format as with FORTRAN code

Question

Hello,
I would like to write out data in a binary format that is used by FORTRAN unformatted direct access files. I have some code in FORTAN that produces the correct format; however, I have been unable to reproduce the output with a Java method.
The FORTAN code to write an array Z is:
REAL Z(72,46,16)
OPEN(8,FILE='grads.dat',FORM='UNFORMATTED',
& ACCESS='DIRECT',RECL=72*46)
IREC=1
DO 10 I=1,16
WRITE (8,REC=IREC) ((Z(J,K,I),J=1,72),K=1,46)
IREC=IREC+1
10 CONTINUE
The Java code I was able to come up with to write out an array arrTS produces binary data differently:
          FileOutputStream fosOut = new FileOutputStream(filename,false);
          for(int x=0; x<this.xmax; x++) {
               for(int y=0; y<this.ymax; y++) {
                    ByteArrayOutputStream bosOut = new ByteArrayOutputStream(2);
                    DataOutputStream dos = new DataOutputStream(bosOut);
                    dos.writeFloat((float)this.arrTS[x][y]);
                    byte[] arrByte = bosOut.toByteArray();
                    fosOut.write(arrByte);
          fosOut.close();
Any help is greatly appreciated.
Best regards,
Stefan

Answer 1

I am using a software to read in the data that I am calculating in Java. I cannot easily change the format that software is reading; therefore, ASCII is not an option.
The software that reads the data states something about "Little-endian". Do you which Java classes to use for that?
Best regards,
Stefan
First, you need to find out the format of yourFORTRAN
output. Is it ASCII? EBCDIC? BCD? IEEE?
Big-endian? Little-endian?
Until you know that you won't know which Javaclasses
to use.Also I wouldn't be too sure different FORTRAN
compilers use the same data format.
In my view the best system interchange format still is
the ASCII text file. Why don't you let the Fortran
program use it to write its data to file. It should be
no problem reading it from Java.