RandomAccessFile writechar method writing NULto file and writeUTF writing ENQ , how to get ridoff those?

Question

In java.io.RandomAccessFile , when the method writeChar() is used to write a char array in loop to a Text file as

RandomAccessFile txtfile = new RandomAccessFile("Hello.txt","rw");
char c[] = {'S','i','g','n','e','d'};
for(char k:c) txtfile.writeChar(k);

Gives a Result in Hello.txt as when opened in normal notepad

 S i g n e d

but , when opened with text Editor NotePad++ the Hello.txt is shown as

 [NUL]S[NUL]i[NUL]g[NUL]n[NUL]e[NUL]d

and when i used writeUTF() method to write a String to Hello.txt as

txtfile.writeUTF("hello");

it given result as a blank space in front and when opened in NotePad++ it is showing as

[ENQ]hello

How i can write or append a Normal Line to file with out Spaces(like [NUL] or [ENQ] ) as in this case ?

please post answer how to write any String to a file in RandomAccessFile in Java !

Thanks in Advance !

Which file encoding do you want to use? What you describe is the desired behavior if UTF-16 is used as file encoding. — Xaver, Dec 20 '20 at 18:39
Yes i got it ,I tried to write a UTF-8 byte in the format of UTF-16 ! so it given a NUL in front of every char it written! — Mahanth_Maha, Dec 21 '20 at 16:53

CryptoFool · Accepted Answer · 2020-12-20T19:07:50.100

A char value in Java is two bytes. RandomAccessFile is meant to read and write binary data. It does not do any text transformations. When asked to write a character, it just writes the in-memory representation of that character to disk.

Look at the documentation for the RandomAccessFile class:

writeChar(int v)

Writes a char to the file as a two-byte value, high byte first.

writeByte(int v)

Writes a byte to the file as a one-byte value.

writeBytes(String s)

Writes the string to the file as a sequence of bytes.

So use writeByte instead of writeChar to write a character to the file as a single ASCII byte that all editors should deal with in the same way. To write a String to the file as single-byte characters in one call, use the writeBytes method, which takes a String and writes it to the file as single-byte characters.

If you only want to write text to a file, it's better to use a FileWriter or OutputStreamWriter class to do so. These classes write text taking character encoding into account. The former assumes a default character encoding. The latter allows you to specify the character encoding you want the class to use to convert text to bytes before writing to the file.

RandomAccessFile writechar method writing NULto file and writeUTF writing ENQ , how to get ridoff those?

1 Answers1