Special characters in file ^@

Question

hi,
i used method tostring to convert a double into string and have written in a file,
while i try to open the file in shell(unix), it shows some special characters as follows,
^@0^@.^@0^@4^@3^@7^@4^@0^@7^@
^@0^@.^@0^@3^@1^@3^@1^@9^@2^@
^@0^@.^@0^@1^@6^@5^@0^@2^@9^@
^@0^@.^@0^@0^@3^@1^@8^@5^@5^@1^@
in between each numbers, when i open the same file in textedit it shows as follows,
0.0655756
0.0976344
also i try to do global substitution using unix commands but shows the message pattern not found.
here's my code what should do to get rid of this trouble,
try {
            FileOutputStream fwrite = new FileOutputStream("gridfile.grid");
            DataOutputStream dwrite = new DataOutputStream(fwrite);
            for(int z=0;z<15;z++){
                for(int y=0;y<15;y++){
                    for(int x= 0;x<15;x++){
                        doubgrid = Double.toString(filegrid[x][y][z]);
                        dwrite.writeChars(doubgrid);
                        dwrite.writeChars("\n");
                        //System.out.println("raech");
            fwrite.close();

Answer 1

i didnt finish what i want to write so reposted it
again,
sorry for that,That's ok, it's just that two threads means people can spend time answering the question that's already been answered in the other one. The better thing to do in the future would be just make a new post in the original thread.
I see from your code that you're using the default encoding for the output stream. Since you're writing text, a better way would be to use a BufferedWriter wrapped around a Writer:
new BufferedWriter(new OutputStreamWriter(new FileWriter("filename"), "specify the charset here") );That lets you use a specific encoding instead of relying on the default.