Writing and Read Object

To actually persist the object, use java.io.ObjectOutputStream class:

    FileOutputStream ostream = new FileOutputStream("t.tmp");
    ObjectOutputStream p = new ObjectOutputStream(ostream);
    p.writeInt(12345);
    p.writeObject("Today");
    p.writeObject(new Date());
    p.flush();
    ostream.close(); 

To read back what you have persisted, use the java.io.ObjectInputStream class:

    FileInputStream istream = new FileInputStream("t.tmp");
    ObjectInputStream p = new ObjectInputStream(istream);
    int i = p.readInt();
    String today = (String)p.readObject();
    Date date = (Date)p.readObject();
    istream.close();