是的，只需创建一个
DefaultComboBoxModel为每一组，做
setModel()对
JComboBox2的时候
JComboBox1改变。
附录：例如，
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()); }}
