ObjectOutputStream — Writing Object To a File

This example illustrates using ObjectOutputStream to write an object to a file. This is a part of serialization tutorial.

import java.io.*;

class WriteObj

{

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

    {

        FileOutputStream fout=new FileOutputStream("obj.dat");

        

        ObjectOutputStream out=new ObjectOutputStream(fout);

        

        String st="I am written in the file.";

        

        out.writeObject(st);

        

        out.close();

        fout.close();

    }

}

fout=new FileOutputStream("obj.dat"): This statement creates a FileOutputStream object pointing to obj.dat
out=new ObjectOutputStream(fout): This statement creates an ObjectOutputStream object pointing to the given FileOutputStream object.
writeObject(st): This method in the ObjectOutputStream class writes a String object to the file obj.dat