cannot find symbol - method iterator()

[D.Calladine]

just wondering how to fix this error its driving me insane

import javax.swing.*;
import java.awt.*;
import javax.swing.JFrame;
import java.util.*;
/**
 * Write a description of class RegHelper here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class RegHelper extends JPanel implements ChooserListener{
private JPanel courseChooserPanel;
private CardLayout layout;
private Map<String,CourseChooser> map;

public RegHelper(ChooserListener listener){
super();
Box box = Box.createVerticalBox();
box.add(new DeptChooser(this));
layout = new CardLayout();
courseChooserPanel = new JPanel(layout);
courseChooserPanel.add(new JPanel(), "");
map = new Hashtable<String, CourseChooser>();
Iterator<Department> iter = Department.getCollection().Iterator();
while(iter.hasNext()) {
Department dept = iter.next();
CourseChooser courseChooser = new CourseChooser(listener, dept);
String deptcode = dept.getCode();
courseChooserPanel.add(courseChooser, deptCode);
map.put(deptCode,courseChooser);
}
box.add(courseChooserPanel);
add(box);
}

public void tell(Object o) {
String deptcode = ((Department) o).getCode();
layout.show(courseChooserPanel, deptCode);
map.get(deptCode).sayAgain();
}
}

[masijade]

Java is case sensitive and the method is iterator, not Iterator