Text and Binary Files
Binary files
Write to a binary file

Common methods of the DataOutput interface

Method	Throws	Description
writeBoolean(boolean)	IOException	Writes a 1-byte boolean value to the output stream.
writeInt(int)	IOException	Writes a 4-byte int value.
writeDouble(double)	IOException	Writes an 8-byte double value.
writeChar(int)	IOException	Writes a 2-byte char value.
writeChars(String)	IOException	Writes a string using 2 bytes per character.
writeUTF(String)	IOException	Writes a 2-byte value for the number of bytes in the string followed by the UTF representation of the string.

Methods of the DataOutputStream class

Method	Throws	Description
size()	None	Returns an int for the number of bytes written to this stream.
flush()	IOException	Flushes any data that's in the buffer to the file.
close()	IOException	Flushes any data that's in the buffer to the file and closes the stream.

Code that writes data to a binary file

// write a Product object to the file
out.writeUTF(product.getCode());
out.writeUTF(product.getDescription());
out.writeDouble(product.getPrice());

// flush data to the file and close the output stream
out.close();