A good answer might be:

A Writer stream translates the characters in a String into UTF character format, which can accomodate many alphabets.

For most Western characters, UTF format is identical to ASCII. Use DataOutputStream.writeBytes() for character output to files that have mixed data types. If a file contains only characters (a text file) use the Writer methods.

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• Binary files.
• The OutputStream class.
• Example program using writeInt().
• Hexadecimal dumps.
• The BufferedOutputStream class.
• Example program using writeDouble().
• Constructors for FileOutputStream.
• Methods and constructors of DataOutputStream.
• High bytes and low bytes.
• The size() method.