Vector class, insertElementAt() method and JComboBox

Question

Hi guys,
I am using a vector called vectorSquare. I have an (Square)object in each component. When I run the program, depending on how many squares the user chooses, the combobox size will be vectorSquare.size(). Everything is all right. But if the user reenter data for one of the square, I think the vectorSquare.size() increases 1. Using vSquares.insertElementAt(temp, comboBox.getSelectedIndex()); when the user enters the data works OK, but if the user wants to change and reenter the data of a square, the new solution will be through the getSelectedIndex()) giving by the JComboBox. Instead, the past result will keep displaying, in getSelectedIndex() + 1 index. I don't know why. I thought insertElementAt() inserts new data but delete the past one, but it doesn't seem at all. Thats why I have decided to delete the past entering. But doing that, it compiles but now doesn't run, and gives an error to me here:
--> if (vSquares.elementAt(comboBox.getSelectedIndex()) != null) {
At the beginning I used:
vSquares.insertElementAt(temp, comboBox.getSelectedIndex());
But it overwrites, so I now use this:
if (vSquares.elementAt(comboBox.getSelectedIndex()) != null) {
     vSquares.removeElementAt(comboBox.getSelectedIndex());
     vSquares.insertElementAt(temp, comboBox.getSelectedIndex());
But it doesnt run as I said above.
Anybody knows what I could do to work it out?
Thank you.

Answer 1

Hi, its me again. I am checking and it still doesn't work. I have tried these different ways and I dont know whats going on??????
vSquares.insertElementAt(temp,comboBox.getSelectedIndex());
vSquares.removeElementAt(comboBox.getSelectedIndex()+1);
++++++++++++++++++++++
vSquares.setElementAt(temp,comboBox.getSelectedIndex());
/++++++++++++++++++++
int p = comboBox.getSelectedIndex();
vSquares.removeElementAt(p);
vSquares.insertElementAt(temp,p);
++++++++++++++++++++++++
int p = comboBox.getSelectedIndex();
vSquares.setElementAt(temp,p);