DataOutputStream class « DataOutputStream « Stream for Output « File Stream

A data output stream lets an application write primitive Java data types to an output stream.

Constructor	Summary
DataOutputStream(OutputStream out)	Creates a new data output stream to write data to the specified underlying output stream.

Return	Method	Summary
void	flush()	Flushes this data output stream.
int	size()	Returns the current value of the counter written, the number of bytes written to this data output stream so far.
void	write(byte[] b, int off, int len)	Writes len bytes from the specified byte array starting at offset off to the underlying output stream.
void	write(int b)	Writes the specified byte (the low eight bits of the argument b) to the underlying output stream.
void	writeBoolean(boolean v)	Writes a boolean as a 1-byte value.
void	writeByte(int v)	Writes out a byte as a 1-byte value.
void	writeBytes(String s)	Writes out the string as a sequence of bytes.
void	writeChar(int v)	Writes a char to as a 2-byte value, high byte first.
void	writeChars(String s)	Writes a string as a sequence of characters.
void	writeDouble(double v)	Converts the double argument to a long using the doubleToLongBits method in class Double, and then writes that long value to the underlying output stream as an 8-byte quantity, high byte first.
void	writeFloat(float v)	Converts the float argument to an int using the floatToIntBits method in class Float, and then writes that int value to the underlying output stream as a 4-byte quantity, high byte first.
void	writeInt(int v)	Writes an int to the underlying output stream as four bytes, high byte first.
void	writeLong(long v)	Writes a long as eight bytes, high byte first.
void	writeShort(int v)	Writes a short as two bytes, high byte first.
void	writeUTF(String str)	Writes a string using modified UTF-8 encoding in a machine-independent manner.


import java.io.DataOutputStream;
import java.io.FileOutputStream;

public class Main {

  public static void main(String args[]) throws Exception {

    FileOutputStream fos = new FileOutputStream("c:/a.txt");

    DataOutputStream dos = new DataOutputStream(fos);

    dos.writeShort(1);
    dos.writeBytes("java2s.com");
    dos.writeChar('a');
    dos.writeBoolean(true);

    fos.close();
  }
}