FileOutputStream class « FileOutputStream « Stream for Output « File Stream

A file output stream is an output stream for writing data to a File or to a FileDescriptor.

Constructor	Summary
FileOutputStream(File file)	Creates a file output stream to write to the file represented by the specified File object.
FileOutputStream(File file, boolean append)	Creates a file output stream to write to the file represented by the specified File object.
FileOutputStream(FileDescriptor fdObj)	Creates an output file stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system.
FileOutputStream(String name)	Creates an output file stream to write to the file with the specified name.
FileOutputStream(String name, boolean append)	Creates an output file stream to write to the file with the specified name.

Return	Method	Summary
void	close()	Closes this file output stream and releases any system resources associated with this stream.
FileChannel	getChannel()	Returns the unique FileChannel object associated with this file output stream.
FileDescriptor	getFD()	Returns the file descriptor associated with this stream.
void	write(byte[] b)	Writes b.length bytes from the specified byte array to this file output stream.
void	write(byte[] b, int off, int len)	Writes len bytes from the specified byte array starting at offset off to this file output stream.
void	write(int b)	Writes the specified byte to this file output stream.


import java.io.File;
import java.io.FileOutputStream;

public class Main {
  public static void main(String[] args) throws Exception {
    File file = new File("C:/demo.txt");
    FileOutputStream fos = new FileOutputStream(file);
  }
}


import java.io.FileOutputStream;

public class Main {

  public static void main(String[] args) throws Exception {
    FileOutputStream fos = new FileOutputStream("C:/demo.txt");

    byte b = 01;
    fos.write(b);
    fos.close();
  }
}