我有以下数据(String)：
Course1: A1 Course1: A2 Course2: B1 Course2: B2 Course2: B3 Course2: B4 Course3: C1 Course3: C2
我想创建两个JComboBox(JComboBox1,JComboBox2),以便JComboBox1包含Course1,Course2,Course3等.
如果我从JComboBox1中选择了Course2,则相应的B1,B2,B3,B4应该填入JComboBox2.
如何实现？非常感谢.
解决方法
是的,只需为每个集合创建一个
DefaultComboBoxModel,并在JComboBox1更改时在JComboBox2上执行setModel().
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()); } }
