// Copyright 1997, <a href=http://www.MageLang.com>MageLang Institute</a>.

import java.io.*;
import java.util.Date;
import java.util.Vector;
import java.util.Enumeration;

class TreeNode implements Serializable {
  Vector children;
  TreeNode parent;
  String name;

  public TreeNode(String s) {
     children = new Vector(5);
     name = s;
  }

  public void addChild(TreeNode n) {
     children.addElement(n);
     n.parent = this;
  }

  public String toString() {
     Enumeration e = children.elements();
     StringBuffer buff = new StringBuffer(100);
     buff.append("[ " +  name + " : ");
     while(e.hasMoreElements()) {
         buff.append(e.nextElement().toString());
     }
     buff.append(" ] ");
     return buff.toString();
  }

}

public class SerialTest {

  public static void main(String[] args) {

  // first build a tree
  TreeNode top = new TreeNode("top");
  top.addChild(new TreeNode("left"));
  top.addChild(new TreeNode("right"));

  // print it out to see how it looks
  System.out.println("source tree:  \n" + top.toString());

   // now write the tree to a file, and read it back in again
   try {
     FileOutputStream fOut = new FileOutputStream("test.out");
     ObjectOutput out = new ObjectOutputStream(fOut);
     out.writeObject(top);
     out.flush();
     out.close();

     FileInputStream fIn = new FileInputStream("test.out");
     ObjectInputStream in = new ObjectInputStream(fIn);
     TreeNode n = (TreeNode)in.readObject();
     in.close();
     System.out.println("read tree: \n" + n.toString());
   } catch (Exception e) { System.out.println("exception: " + e); }
  }

}