I have following data (String):
Course1: A1
Course1: A2
Course2: B1
Course2: B2
Course2: B3
Course2: B4
Course3: C1
Course3: C2
I'd like to create two JComboBox (JComboBox1, JComboBox2) so that JComboBox1 contains Course1,Course2,Course3, etc.
If I select, say, Course2 from JComboBox1 then corresponding B1,B2,B3,B4 should be populated in JComboBox2.
How to implement this? Many Thanks.
Yes, simply create a DefaultComboBoxModel
for each set, and do setModel()
on JComboBox2
when JComboBox1
changes.
Addendum: For example,
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ComboTest extends JPanel implements ActionListener, Runnable {
private final JComboBox combo1 = new JComboBox(
new String[]{"Course 1", "Course 2", "Course 3"});
private final JComboBox combo2 = new JComboBox();
private ComboBoxModel[] models = new ComboBoxModel[3];
public ComboTest() {
models[0] = new DefaultComboBoxModel(
new String[]{"A1", "A2"});
models[1] = new DefaultComboBoxModel(
new String[]{"B1", "B2", "B3", "B4"});
models[2] = new DefaultComboBoxModel(
new String[]{"C1", "C2"});
combo2.setModel(models[0]);
this.add(combo1);
this.add(combo2);
combo1.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
int i = combo1.getSelectedIndex();
combo2.setModel(models[i]);
}
@Override
public void run() {
JFrame f = new JFrame("ComboTest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new ComboTest());
}
}