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我在添加另一個JPanel到我的框架時，我使用組合框的問題。 我想根據組合框中的選擇更改中央面板。 我爲所有選擇製作了不同的面板，但沒有添加到我的主面板中。 我添加了代碼。廣告選擇的面板丟失JCombobox
謝謝:)
import AllClasses.FlightCompany;
{
public class WorkerDialog extends JFrame {
private JPanel Worker;
private String[] LabelNames = { "Worker Type:", " Worker Name:" };
String [] str = { "Office", "Host",
"Pilot" };
JComboBox<String> ChooseBox = new JComboBox<>(str);
public JPanel MainPanel;
private JPanel [] p= new JPanel[3];
public WorkerDialog(FlightCompany f) {
super("Worker Dialog");
p[0] = new Office_Gui();
p[1] = new Host_Gui();
p[2] = new Pilot_Gui();
Worker = new JPanel(new FlowLayout(FlowLayout.LEFT, 5, 5));
JLabel LabelName = new JLabel(LabelNames[0]);
JLabel LabelName2 = new JLabel(LabelNames[1]);
JTextField fieldBox = new JTextField();
LabelName.setSize(40, 25);
ChooseBox.setPreferredSize(new Dimension(180, 22));
Worker.add(LabelName);
Worker.add(ChooseBox);
Worker.add(LabelName2);
fieldBox.setPreferredSize(new Dimension(180, 22));
Worker.add(fieldBox);
JPanel AddPanel = new JPanel(new GridLayout(2, 1, 1, 1));
AddPanel.add(new JButton("Add"));
AddPanel.add(new JButton("TakeOff"));
MainPanel = new JPanel(new BorderLayout(3, 3));
AddPanel.setPreferredSize(new Dimension(0, 110));
ChooseBox.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent e) {
// TODO Auto-generated method stub
//String str = e.getActionCommand();
String jb = (String) ChooseBox.getSelectedItem();
if (jb.equals("Office")){
MainPanel.add(p[0],BorderLayout.CENTER);
System.out.println("Office");}
}
});
MainPanel.add(Worker, BorderLayout.NORTH);
MainPanel.add(AddPanel, BorderLayout.SOUTH);
add(MainPanel);
//pack();
setSize(560, 300);
setAlwaysOnTop(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setResizable(false);
setVisible(true);