I have an List of LinkedList objects.
List<LinkedList<File1>> backup = new ArrayList<LinkedList<File1>>();
The LinkedList contains some elements. I need to add additional elements dynamically by clicking a button. While doing this, I'm getting a concurrent modification error. I really don't understand why this error is popping up. Here is the code:
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt)
{
// When JOIN button is clicked
int parent_node,dist_node;
// List<File1> temp_list = new ArrayList<File1>();
File1 f_new = new File1();
parent_node = Integer.parseInt(jTextField4.getText());
dist_node = Integer.parseInt(jTextField5.getText());
LinkedList<File1> tmp_bk = backup.get(parent_node);
System.out.println("parent node : " + parent_node);
System.out.println("dist node : " + dist_node);
System.out.println("no of lists : " + backup.size());
f_new.nod = backup.size();
f_new.dist = dist_node;
// temp_list.add(f_new);
tmp_bk.add(f_new);
ListIterator itr = it_bk.get(parent_node);
while(itr.hasNext())
{
File1 f = (File1)itr.next();
System.out.println("NODE : " + f.nod + "DIST : " + f.dist);
}
}