ObjectOutputStream class « ObjectOutputStream « Stream for Output « File Stream

An ObjectOutputStream writes primitive data types and Java objects to an OutputStream.

Constructor	Summary
ObjectOutputStream(OutputStream out)	Creates an ObjectOutputStream that writes to the specified OutputStream.

Return	Method	Summary
void	close()	Closes the stream.
void	defaultWriteObject()	Write the non-static and non-transient fields of the current class to this stream.
void	flush()	Flushes the stream.
void	reset()	Reset will disregard the state of any objects already written to the stream.
void	useProtocolVersion(int version)	Specify stream protocol version to use when writing the stream.
void	write(byte[] buf)	Writes an array of bytes.
void	write(byte[] buf, int off, int len)	Writes a sub array of bytes.
void	write(int val)	Writes a byte.
void	writeBoolean(boolean val)	Writes a boolean.
void	writeByte(int val)	Writes an 8 bit byte.
void	writeBytes(String str)	Writes a String as a sequence of bytes.
void	writeChar(int val)	Writes a 16 bit char.
void	writeChars(String str)	Writes a String as a sequence of chars.
void	writeDouble(double val)	Writes a 64 bit double.
void	writeFields()	Write the buffered fields to the stream.
void	writeFloat(float val)	Writes a 32 bit float.
void	writeInt(int val)	Writes a 32 bit int.
void	writeLong(long val)	Writes a 64 bit long.
void	writeObject(Object obj)	Write the specified object to the ObjectOutputStream.
void	writeShort(int val)	Writes a 16 bit short.
void	writeUnshared(Object obj)	Writes an "unshared" object to the ObjectOutputStream.
void	writeUTF(String str)	Primitive data write of this String in modified UTF-8 format.


import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Date;

public class Main {
  public static void main(String args[]) throws IOException {
    FileOutputStream fos = new FileOutputStream("t.tmp");
    ObjectOutputStream oos = new ObjectOutputStream(fos);

    oos.writeInt(12345);
    oos.writeObject("Today");
    oos.writeObject(new Date());

    oos.close();

  }
}