import java.io.*;
// ...
ObjectOutputStream outobj = 
   new ObjectOutputStream(
     new BufferedOutputStream(
       new FileOutputStream("myObject.ser")));
outobj.writeObject(serializableObject);
outobj.close();


import java.io.*;
// ...
File aFile = new File("myObject.ser");
if (aFile.exists()) {
  ObjectInputStream inobj = 
    new ObjectInputStream(
      new BufferedInputStream(
        new FileInputStream(aFile));
  serializableObject = 
    (SerializableClass)inobj.readObject();
  inobj.close();
}