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Message:

Populating JComboBoxes with JLists(Help!!)

Posted by Matthew Keating on April 21, 2001 at 2:17 AM

I have an assignment where I have to add items to a JComboBox whenever an item of a string array from a JList is selected. How do I use getSelectedValues to get it to work. An examplewould be greatly appreciated. Check the code( it's messy because I got a little lost so I commented a lot out):

import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
import com.ms.security.*;

public class MidTerm extends MyFrameWithExitHandling
implements ListSelectionListener
// , ActionListener
// , ItemListener
//
{
private JList jlst;
private JComboBox jcboSoP = new JComboBox();
private JTextField jtfResult = new JTextField(32);


Dimension dim = new Dimension();
ListSelectionModel lstMod ;
private String stateprov;

private PermissionUtils perm;
private String[]stateprovs ={"WASHINGTON","CALIFORNIA", "QUEBEC","ONTARIO"};


//Main method
public static void main(String[] args)
{
MidTerm frame = new MidTerm();
frame.setSize(500,500);
frame.pack();
frame.center();
frame.setVisible(true);
}

//Constructor
public MidTerm()
{
setTitle(" Mid Term");

JPanel p1 = new JPanel();
p1.setLayout(new FlowLayout(FlowLayout.LEFT));
p1.add(new JLabel("Result"));
p1.add(jtfResult);


JPanel p3 = new JPanel();
p3.setLayout(new FlowLayout(FlowLayout.LEFT));
p3.add(new JLabel("State or Province"));
jlst = new JList(stateprovs);
JScrollPane jsp = new JScrollPane(jlst);
jlst.setVisibleRowCount(3);
jlst.setSelectedIndex(0);
p3.add(jsp);
jlst.setSelectionMode(lstMod.SINGLE_INTERVAL_SELECTION);
p3.add(new JLabel ("City"));
p3.add(jcboSoP = new JComboBox());

//Initialize Choice items
//jcboSoP.addItem ("SEATTLE");
//jcboSoP.addItem ("LA");
//jcboSoP.addItem ("SAN FRANSISCO");
//jcboSoP.addItem ("MONTREAL");
//jcboSoP.addItem("TORONTO");
//jcboSoP.addItem ("OTTAWA");
//jcboSoP.setSelectedIndex (1);
//jcboSoP.removeAll();




JPanel jpAll = new JPanel();
jpAll.setLayout(new GridLayout (3,1));
jpAll.add(p1);

jpAll.add(p3);

getContentPane().setLayout(new BorderLayout());
getContentPane().add(jpAll,BorderLayout.CENTER);


jlst.addListSelectionListener(this);
//jcboSoP.addActionListener(this);


}

public void valueChanged(ListSelectionEvent e)
{
JList jlst = (Jlist)e.getSource();
Object values = jlst.getSelectedValues
//stateprovs = new String [];
//Object[] values = jlst.getSelectedValues();
//stateprovs = new String [values.length];
//stateprovs = perm.ArraytoString(values).trim();

// if ( stateprovs.length() > 1)
//stateprovs = stateprovs.substring(1,state.length() - 2).trim();

jcboSoP.addItem ("SEATTLE");


//JList jlst = (JList)e.getSource();
//Object[] values = jlst.getSelectedValues();
//stateprovs = new String [values.length];
//for (int a=0; a //stateprovs[a] = (String)values[a];
//jcboSoP.addItem ("SEATTLE");
//stateprovs = new String [values.length];
//for (int b=1; b //stateprovs[b] = (String)values[b];
//Object[] values = jlst.getSelectedValues()[1];
//jcboSoP.addItem ("LA");

//for (int b=1; b //stateprovs[b] = (String)values[b];
//jcboSoP.addItem ("LA");
//jcboSoP.addItem ("SAN FRANSISCO");
//public void actionPerformed (ActionEvent e)
//{
// JComboBox jcboSoP = (JComboBox)e.getSource();
// if (jcboSoP.getSelectedItem
// = "SEATTLE")
// jtfResult.setText = "SEATTLE";

// else if (jcboSoP.getSelectedItem
// = "LA")
// jtfResult.setText = "LA";
}
}