1. import java.io.*;2. public class Forest implements Serializable {3. private Tree tree = new Tree();4. public static void main(String [] args) {5. Forest f = new Forest();6. try {7. FileOutputStream fs = new FileOutputStream("Forest.ser");8. ObjectOutputStream os = new ObjectOutputStream(fs);9. os.writeObject(f); os.close();10. } catch (Exception ex) { ex.printStackTrace(); }11. } 12.}13. class Tree { }