reading an writting Serializable file

[Daniel Stallard]

This is my code for writing the file

	public  void writeSerializable(ArrayList<Stock> stock ) // menu item #2
	{

		Frame f = new Frame();	

		FileDialog foBox = new FileDialog(f,"Saving file", FileDialog.SAVE);
		foBox.setVisible(true);

		String foName = foBox.getFile();
		String dirPath = foBox.getDirectory();
		// create a File instance for that absolute path
		File outFile = new File(dirPath+foName);

		FileOutputStream OS=null;
		ObjectOutputStream OOS=null;
		
		try
		{

			OS = new FileOutputStream(outFile);

			OOS = new ObjectOutputStream(OS);			
			
			OOS.writeObject(stock);			

		}
	//From what i can follow the issue is here
		catch (IOException io)
		{
			io.printStackTrace();            // shows any errors
			System.out.println("An IO Exception occurred");
		}
		finally  
		{
			
			try{
			OOS.close();
			}
			catch (Exception e) {} 
		}
	}

This is the error it is giving me an i have no clue what the problem is

java.io.NotSerializableException:Stock
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
	at java.util.ArrayList.writeObject(ArrayList.java:747)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
	at dstallard.Pro.MenuInfo.writeSerializable(MenuInfo.java:111)
	at dstallard.Pro.StockDriver.main(StockDriver.java:33)

I have no clue what these are talking about. Any help would be great i am only posting the writing the file first then ill test it an then post the reading error.

[Carey Brown]

Not all classes are serializable. Is Stock a class you wrote? If so, you can add serialization support to your class.

See this tutorial for more info.