Collections, Collection From one class to another

[D.Calladine]

Hi, im trying to get a collection from one class Department to another Class DeptChooser, so i can put it into an array into a JList and then display it i can get it into a Jlist and display but can't get from Department class into DeptChooser.

[code]
import javax.swing.*;
import java.awt.*;
import javax.swing.JFrame;
import java.util.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* allows user to choose from a variety of different departments.
*
* @author (Danny Calladine)
* @version (1.0)
*/
public class DeptChooser extends JPanel implements ActionListener
{
private Department[] dept;
private JList deptlist;
private JList courlist;
private ChooserListener callback;
GridBagConstraints Radio = new GridBagConstraints();
GridBagConstraints Buttons = new GridBagConstraints();
GridBagConstraints DeptPanel = new GridBagConstraints();
GridBagConstraints InputPanel = new GridBagConstraints();
GridBagConstraints CourPanel = new GridBagConstraints();
JPanel panel = new JPanel(new GridBagLayout());
JPanel inputPanel = new JPanel();
JPanel selectPanel = new JPanel();

DeptChooser(){
super();

JFrame frame = new JFrame("Dept");
frame.setSize(560, 350);
frame.setVisible(true);
frame.add(panel);
inputPanel.setLayout(new BoxLayout(inputPanel, BoxLayout.Y_AXIS));

Radio.gridx = 0;
Radio.gridy = 1;
Radio.weightx = 0.5;
Buttons.gridx = 0;
Buttons.gridy = 2;
Buttons.weightx = 0.5;
DeptPanel.gridx = 3;
DeptPanel.gridy = 0;
DeptPanel.weightx = 0.5;
CourPanel.gridx = 3;
CourPanel.gridy = 1;
CourPanel.weightx = 0.5;
InputPanel.gridx = 0;
InputPanel.gridy = 0;
InputPanel.weightx = 0.5;

collection.toArray(Department[0]);
JList deptList = new JList(dept);
deptList.setSelectionMode(ListSelectionModel.SINGL E_SELECTION);
panel.add(deptList, DeptPanel);
JScrollPane deptListscroll = new JScrollPane(deptList, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
panel.add(deptListscroll, DeptPanel);

String [] courdata = {"Computer Science","Robotics","Internet Computing","Bussiness Computing","Artifical Intelligence"};
JList courList = new JList(courdata);
deptList.setSelectionMode(ListSelectionModel.SINGL E_SELECTION);
panel.add(courList, CourPanel);
JScrollPane courListscroll = new JScrollPane(courList, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
panel.add(courListscroll, CourPanel);

addField("Name",(new JTextField(20)));
addField("UoB",(new JTextField(8)));

panel.add(inputPanel, InputPanel);

JRadioButton Stage1 = new JRadioButton("Stage 1");
JRadioButton Stage2 = new JRadioButton("Stage 2");
JRadioButton Stage3 = new JRadioButton("Stage 3");

ButtonGroup group = new ButtonGroup();
group.add(Stage1);
group.add(Stage2);
group.add(Stage3);

JPanel radioPanel = new JPanel(new GridLayout(1, 0));
radioPanel.add(Stage1);
radioPanel.add(Stage2);
radioPanel.add(Stage3);

radioPanel.setBorder(BorderFactory.createTitledBor der(
BorderFactory.createEtchedBorder(), "Stages"));

panel.add(radioPanel, Radio);

JButton Clear = new JButton("Clear");
Clear.addActionListener(this);
JButton Submit = new JButton("Submit");
Submit.addActionListener(this);

JPanel Button = new JPanel(new GridLayout(1, 0));

Button.add(Clear);
Button.add(Submit);

panel.add(Button, Buttons);

}
public void addField(String label, JComponent field) {
inputPanel.add(new JLabel(label));
inputPanel.add(field);
}
public void actionPerformed(ActionEvent e) {
}
}

[\code]
this is the Deptchooser class code

[code]
import java.util.*;
/**
* Each instance of class Department represents an academic department that
* offers taught courses. A department is identified by a department code.
* The Class holds the collection of all academic departmnents
* @author Rod Fretwell
* @version October 2008
*/
public class Department {
// class attribute
private static Map<String,Department> allDepts
= new TreeMap<String,Department>();
// instance variables
private String code;
private String name;
private Map<String,Course> set; // list of courses offered by the department

/**
* Creates a Department object with the given attributes and adds that
* object to the collection of departments provided that there is not
* already a department recorded with the given department code. In that
* case the return value is null.
* A new Department record is not created if there is already a record with
* the given department code. In that case the method returns the
* previously stored Department object for the user's information.
* @param code the department code
* @param name the name of the department
* @return null for a new department, otherwise previously stored
* Department object for the given department code
*/
public static Department add(String code, String name) {
Department retValue = allDepts.get(code);
if (retValue==null)
allDepts.put(code, new Department(code, name));
return retValue;
}

private Department(String code, String name) {
this.code = code;
this.name = name;
set = new TreeMap<String,Course>();
}

/**
* Returns the department for a given code or null if there is no
* department for the code
* @param code the department code
* @return the department for the given code or null if there is no such
* department
*/
public static Department get(String code) { return allDepts.get(code); }

/**
* Returns the collection of all departments.
* The collection's iterator returns the departments in ascending order
* of department code.
* @return the collection of all departments
*/
public static Collection<Department> getCollection() {
return allDepts.values();
}

/**
* Returns the code for the department
* @return the code for the department
*/
public String getCode() { return code; }

/**
* Returns the name of the department
* @return the name of the department
*/
public String getName() { return name; }

/**
* Adds a Course object to the collection of courses offered by the
* department
* @param course the Course to be added
*/
public void add(Course course) {
set.put(course.getCode(),course);
}

/**
* Returns the collection of all courses offered by the department.
* The collection's iterator returns the courses in ascending order
* of course code.
* @return the collection of all courses offered by the department
*/
public Collection<Course> getCourses() { return set.values(); }
}
[\code]

there is a loader class that loads some department into it.

im just wondering how i can get the collection and move it into an array in the deptchooser class so that i can then add it into a Jlist.

Thank you

[Fubarable]

Please edit your post to add well-formed code tags. The tags for this forum are

[cod&#101;] -- above code block

[/cod&#101;] -- below code block

[Tolls]

You have the slash the wrong way round...

Anyway, there is a useful method in Collection you might want to use to get an array.