Question

I am trying to write Long using Java command for Random File IO as follows:

fstreamOut = new FileOutputStream(new File("C:\\Basmah","dataOutput.7"),true);
DataOutputStream out=new DataOutputStream(fstreamOut);
Long p= Long.parseLong(longNumberInString );  // Number of digits for this long key are 7-15
              out.writeLong(p);                  

The problem is that when I write 7-15 digit number using writeLong ; it writes 8 bytes in file.
Then I am trying to read the same record into my program and decode it

Long l=in.readLong();

but I dont get the same number as I wrote ; Instead Iget EOF exception.

Answer 1

A long id 64-bit long. That makes 8 bytes. The DataOutputStream’s writeLong method writes the binary representation of the long, not the textual one.
Without knowing the code used to read the long value, it’s impossible to tell why it doesn’t work.