Removing null value line in “.dat” file when using PrintWriter

Question

Anyone know how to remove null value line in ".dat" file when I create file using PrintWriter ? Why does the file just print a null line in the last page of line, I already put:

PrintWriter outputFile = new PrintWriter(new FileWriter(File file));

then after I do process .. I put:

outputFile.flush();
outputFile.close();

But null is still printing on the last line. When I try to save the file in .txt format, there is no null line. but I need to save as a ".Dat" file.

Answer 1

Suffix doesn't matter for a file, so there should be no difference between these two files. The null value you saw in .Dat file is maybe a place-holder for editor that you opened the file with.