我在Java中创建了一个GUI，但现在我必须以这样的方式向JList的元素添加侦听器，以便根据JList中的选定项来更改GUI的一部分。我能怎么做？
这就是我现在所拥有的。 http://www.mediafire.com/view/7e96723qdig9jq4/2.png
这是该计划应该做的。 http://www.mediafire.com/view/11tate8v9b6a0q9/2m.png
正如您可以通过选择左侧的Claire项目从图像中看到的那样，右侧字段（JTextField）将会更改。 目前，要在右侧字段中输入的值为＆＃34; static＆＃34;，将从数据库中获取以下值。
这是我的代码：
public class Inbox {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
JPanel titlePanel = new JPanel();
JPanel centerPanel = new JPanel();
JPanel listPanel = new JPanel();
JPanel listRicPanel = new JPanel();
JPanel listInvPanel = new JPanel();
JPanel messPanel = new JPanel();
JPanel labelPanel = new JPanel();
JPanel inputPanel = new JPanel();
JPanel buttonPanel = new JPanel();
Hashtable<String, String[]> subItems = new Hashtable<String, String[]>();
JComboBox<String> tendina;
JList<String> subList;
JTextField mittente = new JTextField(40);
JTextField oggetto = new JTextField(40);
JTextArea body = new JTextArea();
JLabel mittDestL = new JLabel("Mittente:");
GridBagConstraints c;
String ricevuti[] = {"Alex", "Ben", "Claire", "Dana", "Ellen", "Felicia", "Gary", "Hailey", "Imogen", "Jay", "Kate", "Alex", "Ben", "Claire", "Dana", "Ellen", "Felicia", "Gary", "Hailey", "Imogen", "Jay", "Kate"};
//JList ricList = new JList(ricevuti);
String inviati[] = {"Lara", "Megan", "Nikole", "Oscar", "Paige", "Quentin", "Ralph", "Sara", "Thelma", "Victoria", "William"};
//JList invList = new JList(inviati);
String ricInv[] = {"Seleziona un item..", "Ricevuti", "Inviati"};
Inbox() {
frame.setTitle("Inbox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel);
frame.setVisible(true);
panel.setLayout(new BorderLayout());
centerPanel.setLayout(new BorderLayout());
listPanel.setLayout(new GridBagLayout());
messPanel.setLayout(new GridBagLayout());
panel.add(titlePanel, BorderLayout.NORTH);
panel.add(buttonPanel, BorderLayout.SOUTH);
panel.add(centerPanel, BorderLayout.CENTER);
centerPanel.add(listPanel, BorderLayout.WEST);
centerPanel.add(messPanel, BorderLayout.CENTER);
/*** Tendina ***/
tendina = new JComboBox<String>(ricInv);
tendina.setEditable(false);
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(-295, 10, 0, 0);
c.weightx = 1;
listPanel.add(tendina, c);
/*** Lista dinamica ***/
subList = new JList<String>();
subList.setVisibleRowCount(16);
subList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
JScrollPane scrollList = new JScrollPane(subList);
subItems.put(ricInv[1], ricevuti);
subItems.put(ricInv[2], inviati);
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(30, 10, 0, 0); //top, left, bottom, right
c.weightx = 1;
listPanel.add(scrollList, c);
/*** Messaggio ***/
//mittente o destinatario
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.gridx = 0;
c.gridy = 1; //0
c.insets = new Insets(0, 32, 0, 0);
c.weightx = 1;
messPanel.add(mittDestL, c);
mittente.setEditable(false);
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 3;
c.gridx = 1;
c.gridy = 1;
c.insets = new Insets(5, 10, 5, 10);
c.weightx = 1;
messPanel.add(mittente, c);
//oggetto
JLabel oggL = new JLabel("Oggetto:");
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.gridx = 0;
c.gridy = 2;
c.insets = new Insets(-3, 34, 0, 0);
c.weightx = 1;
messPanel.add(oggL, c);
oggetto.setEditable(false);
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 3;
c.gridx = 1;
c.gridy = 2;
c.insets = new Insets(5, 10, 5, 10);
c.weightx = 1;
messPanel.add(oggetto, c);
//messaggio
JLabel messL = new JLabel("Messaggio:");
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridwidth = 1;
c.gridx = 0;
c.gridy = 3; //3
c.insets = new Insets(-235, 18, 0, 0);
c.weightx = 1;
messPanel.add(messL, c);
body.setEditable(false);
JScrollPane scroll = new JScrollPane(body);
body.setLineWrap(true);
body.setWrapStyleWord(true);
scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scroll.setPreferredSize(new Dimension(250, 250));
c = new GridBagConstraints();
c.anchor = GridBagConstraints.NORTH;
c.fill = GridBagConstraints.BOTH;
c.gridwidth = 3;
c.gridx = 1;
c.gridy = 3;//3
c.insets = new Insets(5, 10, 5, 10);
c.weightx = 1;
messPanel.add(scroll, c);
frame.pack();
//listener
ricInv();
}
public void ricInv() {
tendina.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String item = (String)tendina.getSelectedItem();
Object o = subItems.get(item);
if(o == null)
subList.setModel(new DefaultComboBoxModel());
else
subList.setModel(new DefaultComboBoxModel((String[])o));
}
});
}
}
这看起来很复杂，因为我使用了很多不同的面板。
最初我有两个不同的JList（ricList和invList）因为我没有JComboBox所以我一起展示了两个JList。 但现在我有一个JList，其内容根据JComboBox中选择的内容而变化。
如何根据JComboBox中的选择为JList的每个元素添加一个侦听器？
我希望我已经清楚地解释了我会得到什么，如果没有，我道歉并准备提供更多细节。
谢谢