Saving an object

Question

I have code that is behaving wierd.
When I save a graph a file is produced without any errors, but when I read the object an empty screen (blank) is produced.
Could help me resolve this or offer any suggestions
OutputStream out = null;
     InputStream in = null;
    OutputStream outBuffer = null;
    InputStream inBuffer = null;
    ObjectOutputStream objectOut = null;
    ObjectInputStream objectIn = null;
public void readObject(){
     try{
          in = new FileInputStream("test.gif");
          inBuffer = new BufferedInputStream(in);
          objectIn = new ObjectInputStream(inBuffer);
          objectIn.readObject();
          }catch(Exception e){e.printStackTrace();}
          finally{
               if(objectIn != null)
               try{ objectIn.close();}catch(IOException e){e.printStackTrace();}
public void writeObject(){
     try{
          out = new FileOutputStream("test.gif");
          outBuffer = new BufferedOutputStream(out);
          objectOut = new ObjectOutputStream(outBuffer);
          objectOut.writeObject(graph);
          }catch(Exception e){e.printStackTrace();}
          finally{
               if(objectOut != null)
               try{ objectOut.close();}catch(IOException e){e.printStackTrace();}
     }this is later called in the actionlistener for my menubar
GraphicEvaluator contains the main part of the program
public void actionPerformed (ActionEvent event)
        // Determine which object was the source of the event.
        Object source = event.getSource ();
else if (source == menuSave)
             writeObject();
         else if (source == menuOpen)
               GraphicEvaluator GE = new GraphicEvaluator();
               GE.readObject ();
               GE.setVisible(true);
        }

Answer 1

deos this solve the problem?
having a look at your readObject() method:
public void readObject(){
     try{
          in = new FileInputStream("test.gif");
          inBuffer = new BufferedInputStream(in);
          objectIn = new ObjectInputStream(inBuffer);
          objectIn.readObject();
          }catch(Exception e){e.printStackTrace();}
          finally{
               if(objectIn != null)
               try{ objectIn.close();}catch(IOException e){e.printStackTrace();}
}you should be doing something like this:
public void readObject(){
     try{
          in = new FileInputStream("test.gif");
          inBuffer = new BufferedInputStream(in);
          objectIn = new ObjectInputStream(inBuffer);
          //change this line
          //objectIn.readObject();
          Object obj = objectIn.readObject();
          }catch(Exception e){e.printStackTrace();}
          finally{
               if(objectIn != null)
               try{ objectIn.close();}catch(IOException e){e.printStackTrace();}
obj will now be the object you have read in. Because the ObjectInputStream's readObject returns an object. You should then cast this object to whatever its meant to be