Problem about JTable's DataVector probelm

Question

I'm writing a database program with JTable, I want to make a copy of the data content of the jtable before editing the values.
I first get the TableModel of the table then get the DataVector out to clone a copy to a new Vector, but when I change the values in the table, the values in both Vector also changed.
Can anyone tell me why this happen? I really need your help. Thanks!
Code:
originalTable = (DefaultTableModel)jTablePO.getModel();
originalVector = (Vector) (orgtable.getDataVector().clone());

Answer 1

You don't actually want to copy the contents of that Vector to another Vector. That's because the contents of the Vector consists of references to a bunch of objects. Copies of those references are actually references to the same objects. That's what you're seeing there.
So you don't want just copies of the references in the Vector. You want the new Vector to contain references to copies of whatever the original Vector contained references to. And since in a JTable, those things you're cloning are themselves Vectors, you have the same problem again at this level.
You need a deep copy of the Vector, is what it boils down to. You should be able to google for that phrase or for deep clone.
Edit: Good, while I was typing all that in a form that I hoped wasn't too confusing, you were already taking my advice.
Message was edited by:
DrClap