dynamicJComboBoxes

我有以下数据（string）：

Course1: A1 Course1: A2 Course2: B1 Course2: B2 Course2: B3 Course2: B4 Course3: C1 Course3: C2 

我想要创build两个JComboBox （JComboBox1，JComboBox2），以便JComboBox1包含Course1，Course2，Course3等

如果我从JComboBox1中selectCourse2，那么相应的B1，B2，B3，B4应该填充到JComboBox2中。

如何实现这个？ 非常感谢。

Answer 1

是的，只需为每个集合创build一个DefaultComboBoxModel ，并在JComboBox1更改时在JComboBox1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()); } } 

Answer 2

是。 您可以将更改事件侦听器添加到更新第二个JComboBox的值的第一个JComboBox。

像这样的东西

 // first comboBox final JComboBox courseBox = new JComboBox( new String[]{"Course 1", "Course 2", "Course 3"}); final JComboBox box2 = new JComboBox(); // Now listen for changes courseBox.addActionListener(new ActionListener(){ void actionPerformed(ActionEvent e){ if(courseBox.getSelectedItem().equals("Course 1")){ // we know that the user picked "Course 1", now change box2 to match // first clear everything box2.removeAllItems(); // now add back relevant values box2.addItem("A1"); box2.addItem("A2"); }else if(...){ // ... } } });