Serialization/Deserialization of an Array of Objects

[Jay Orsaw]

I have a class named face with methods x, y, width, height.


Face Class:

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
	
public class Face implements Serializable
{
	
	//int n;

//Face face[] = new Face[n];
	
		public String faceName;
		public int x, y;

		public int w, h;
	

		
		
		public Face()
		{
                   // this.faceName = "";
                    this.x = 10;
		    this.y = 10;
		    this.w = 100;
		    this.h = 100;
		}

		public Face( int x, int y,int width, int height)
		{
		    this.x = x;
		    this.y = y;
		    this.w = width;
		    this.h = height;		
		}
		public Face(String Name, int x, int y,int width, int height)
		{
			//ace[n] = new Face(faceName, x, y, width, height);
			this.faceName = Name;
		    this.x = x;
		    this.y = y;
		    this.w = width;
		    this.h = height;		
		}

		public void faceName(String Name)
		{
		    this.faceName = Name;
		}

		public String getName()
		{
		    return faceName;
		}

		public void x(int x)
		{
		    this.x = x;
		}
		
    
		public int getX()
		{		
			return this.x;
		}
			
		public void y(int y)
		{
			this.y =  y;
		}
		
		public int getY()
		{
			return this.y;
		}
		
		public void width(int width)
		{
			this.w = width;
		}
		
		public int getWidth()
		{
			return w;
		}
	
		public void height(int height)
		{
			this.h = height;
		}
		
		public int getHeight()
		{
			return h;
		}



   public static void main (String args[])
   {
 
	   Face face = new Face();
	   face.serializeFace();


   }

   public void serializeFace()
   {
 /*Buffer Face Class Data Into a file*/
     /*  int kaw = 10;
	   Face[] face = new Face[kaw];
           
           for (int i = 0; i <= kaw; i++)
           {
           face[i].x = 100;
           face[i].y = 100;
           face[i].w = 100;
           face[i].h = 100;

           }*/
           
	   try{
 
		FileOutputStream fout = new FileOutputStream("c:\\Face.txt");
		ObjectOutputStream oos = new ObjectOutputStream(fout);   
		oos.writeObject(new Face[0]);
                oos.writeObject(new Face[1]);
                oos.flush();
		oos.close();
		System.out.println("Done");
 
	   }catch(Exception ex){
		   ex.printStackTrace();
	   }
   }

}

Plan Class

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * Plan.java
 *
 * Created on Oct 4, 2011, 5:52:16 PM
 */
/**
 *
 * @author Konrad
 */
public class Plan extends JFrame
{
  private int rectWidth;
  private int rectHeight;
  private int a;
  private int x = 0, y = 0;
  private int rectCount = 0;
  private int shelfCount = 0;
  private int displays = 2;
    

  private final int planWidth = 500;
  private final int planHeight = 1000;
  private int shelfWidth; 
  private final int shelfHeight = 10;
  
  
  private Rectangle[] rect = new Rectangle[100];
  private Rectangle[] shelf = new Rectangle[100];
  private Rectangle[] planDisplay = new Rectangle[displays];
    
  Face[] face = new Face[rectCount];
Face face2 = new Face();
  private BufferedImage[] bi = new BufferedImage[rectCount];
  
  

  

    /** Creates new form Plan */
    public Plan() throws IOException
    {	   
      Deserialize();
        initComponents();
        
    }
    
    public void Deserialize()
    {


                    try
                    {
		   FileInputStream fin = new FileInputStream("c:\\face.txt");
		   ObjectInputStream ois = new ObjectInputStream(fin);
                   
		   Face f[] = (Face[]) ois.readObject();
                   face[0] = f[0];

		   ois.close();
 System.out.println("Done");
      //  Plan face = new Plan();
	   }catch(Exception ex){
		   ex.printStackTrace();
	   } 
    }

}

Then I get this error

java.lang.ArrayIndexOutOfBoundsException: 0
	at Plan.Deserialize(Plan.java:79)
	at Plan.<init>(Plan.java:64)
	at Plan$1.run(Plan.java:258)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
	at java.awt.EventQueue.access$000(EventQueue.java:101)
	at java.awt.EventQueue$3.run(EventQueue.java:666)
	at java.awt.EventQueue$3.run(EventQueue.java:664)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

I've tried it many ways , but I'm not sure why I'm having an issue... I'm able to read in face by itself, but when I turn it into an array, it gives me issues...

[Rob Spoor]

You write a Face[0]. That's an empty array. When you read back that array, it's length is still 0. It simply doesn't have an element 0 - it has no elements at all.

[Jay Orsaw]

I believe I put "rectCount" into the arrays, and rectCount is 0 now.

[Paul Clapham]

The only thing you need to fix is the code which assumes the array is non-empty. Just removing line 11, the one which throws the exception, would be what I would do. I don't see what it's supposed to do anyway.

You started out with an empty array, then you did the serialization/deserialization business, and you ended up with an empty array. You wouldn't expect to have it any other way. And if you switched to lists, you would start out with an empty list and end up with an empty list.

[Jay Orsaw]

I believe I understand what you are saying. I should initialize face[0].x,y..... etc to something, then serialize it in, and then deserialize it back out? I figured that since I already initialized x,y,w,h to be 100 each in the code, but I guess that wouldn't effect it.


What I'm trying to do is take the methods of a class called Face and serialize those values and then deserialize them back out and be able to use that information. I am going to have many Face objects.

[Jay Orsaw]

I figured out my issue... I initalized the Array of faces to be [rectCount] and rectCount was 0... Not sure why face[0] wouldn't work, but [rectCount + 1] works so I'll keep it that way.

[Rob Spoor]

If rectCount is the length of the array, I think you mean rectCount - 1.

[Jay Orsaw]

Rob Spoor wrote:If rectCount is the length of the array, I think you mean rectCount - 1.

Originally I thought that if you initialized an array to 0 it would work, but I wastold that you need to initalize it to 1 to be the first element 0. I thought I used 0 before, I guess not.,....