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? File I/O (and-or) for each loop

 
Geoff Jefferson
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Does this make sense?



Get list being in the following file.

 
Ernest Friedman-Hill
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It writes each object in the list to an ObjectOutputStream. Makes perfect sense, why?

[Jess in Action][AskingGoodQuestions]

 
Geoff Jefferson
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I'm catching an I/O Exception.
 
Ernest Friedman-Hill
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Geoff Jefferson wrote:I'm catching an I/O Exception.



OK, so what's the error message? Exactly which line of your code does the stack trace implicate?

[Jess in Action][AskingGoodQuestions]

 
Geoff Jefferson
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I caught it here. I suppose I had better learn to output the stack trace.

try {
fOut = new FileOutputStream ("C:\\DataFiles");
oOS = new ObjectOutputStream(fOut);

for (ItemFile obj: tableModel.getList()) { // for-each loop

oOS.writeObject(obj);
}
}
catch(IOException evt) {
textFieldSix.setText(" IOE ");
}
}
});
 
Ernest Friedman-Hill
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Geoff Jefferson wrote:I caught it here. I suppose I had better learn to output the stack trace.



Just stick in

evt.printStackTrace();

and then come back and show us what you get.

[Jess in Action][AskingGoodQuestions]

 
Geoff Jefferson
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Nifty. Access denied.
I think windows has denied file access.
I should be able to fix that.


 
Geoff Jefferson
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Well...I fixed the access problem. Now this.




 
Ernest Friedman-Hill
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OK, so sun.swing.table.DefaultTableCellHeaderRenderer$EmptyIcon is not serializable -- i.e., you can't write one to an ObjectOutputStream. So the next question is, what are you trying to accomplish here? You may have to do it another way.

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Geoff Jefferson
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I am trying to write the contents of an ArrayList to a file on the hard drive.
Here is the file that contains the List.

The class ItemFile is after that.





 
Rob Spoor
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What's this "MyTableInterface"? Is it serializable as well?

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Geoff Jefferson
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Ernest Friedman-Hill
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So what do you want to do with the file when you read it back in? I suspect you don't really want to save the MyTableInterface object, right? Maybe you can mark that member variable "transient", so it's not saved, and then re-attach it to the MyTableInterface when the file is loaded back in?

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Geoff Jefferson
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So what do you want to do with the file when you read it back in?



When I read it back in, I want to put it back into the ArrayList.


I suspect you don't really want to save the MyTableInterface object, right?


hhhhmmmmm.


Maybe you can mark that member variable "transient", so it's not saved, and then re-attach it to the MyTableInterface when the file is loaded back in?


I need to study up on transient. I want an ItemFile object to go to the ArrayList for use while the program is using it. Then to store it on disc when not.
 
Rob Spoor
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Even though MyTableInterface extends JPanel and therefore implements Serializable, it is definitely not serializable. It has some input and output streams as fields, and those are definitely not serializable - and therefore neither is MyTableInterface. Consider transient like Ernest suggested.

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Geoff Jefferson
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Even though MyTableInterface extends JPanel and therefore implements Serializable, it is definitely not serializable. It has some input and output streams as fields, and those are definitely not serializable - and therefore neither is MyTableInterface. Consider transient like Ernest suggested.



Alright, I read up on object serialization and if I am correct, I need to implement the java.io.serializable interface in the persistent class. In this case it would be ItemFile, so...

[code]


package mytablemain;

import java.io.Serializable;
import javax.swing.JTextField;

class ItemFile implements Serializable{
ItemFile() {}
MyTableInterface ifObj = new MyTableInterface();

String one;
String two;
String three;
String four;
String five;
String six;

public ItemFile(JTextField textOne, JTextField textTwo, JTextField textThree,
JTextField textFour, JTextField textFive, JTextField textSix)
{
one = textOne.getText();
two = textTwo.getText();
three = textThree.getText();
four = textFour.getText();
five = textFive.getText();
six = textSix.getText();
}

}

[\code]

Then I need to persist the object by calling the ObjectOutputStream.writeObject() method. Which I have done in the following file.

[code]

buttonThree.addActionListener( // write listArray to file
new ActionListener() {
public void actionPerformed( ActionEvent e) {

try {
fOut = new FileOutputStream ("C:\\Jeff\\NetBeans Gui Building\\MyTableMain\\DataFiles");
oOS = new ObjectOutputStream(fOut);

for (ItemFile obj: tableModel.getList()) { // for-each loop
oOS.writeObject(obj);
}
}
catch(IOException evt) {
textFieldSix.setText(" IOE ");
evt.printStackTrace();
}
}
});
[\code]

I still get the following error output:

java.io.NotSerializableException: sun.swing.table.DefaultTableCellHeaderRenderer$EmptyIcon
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)

... and so on.
 
Geoff Jefferson
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Please disregard, I found an error in ItemFile.

Geoff
 
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