JOptionPane或JFrame從JCalendar返回值

Question

是否有可能從JFrame或JOptionPane中返回一個來自Flib的Jcalendar的值？ JCalendar需要自己的Listener類。我有這個：

org.freixas.jcalendar.JCalendar jd = new org.freixas.jcalendar.JCalendar(org.freixas.jcalendar.JCalendar.DISPLAY_DATE | org.freixas.jcalendar.JCalendar.DISPLAY_TIME,true); 
    KalendarPanel kalendar = new KalendarPanel(); 
    String message = "Choose start date:\n"; 
    Object[] params = {message, jd}; 
    JOptionPane.showConfirmDialog(null, params, "Start date", JOptionPane.PLAIN_MESSAGE); 

但我不知道如何添加Listener類和如何從JOptionPane返回值。在JFrame中，我可以添加類監聽器，但我不知道如何將值返回給父JFrame。 JFrame代碼：

public class Kalendar extends javax.swing.JFrame { 

private Calendar date; 
private SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:MM:ss"); 
private String datum; 


public Kalendar() { 
    initComponents(); 
    jCalendar1.addDateListener(new MyDateListener()); 
} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">       
private void initComponents() { 

    jCalendar1 = new org.freixas.jcalendar.JCalendar(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addComponent(jCalendar1, javax.swing.GroupLayout.PREFERRED_SIZE, 315, javax.swing.GroupLayout.PREFERRED_SIZE) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addComponent(jCalendar1, javax.swing.GroupLayout.PREFERRED_SIZE, 188, javax.swing.GroupLayout.PREFERRED_SIZE) 
    ); 

    pack(); 
}// </editor-fold>       


// Variables declaration - do not modify      
private org.freixas.jcalendar.JCalendar jCalendar1; 
// End of variables declaration     

class MyDateListener implements DateListener { 

    @Override 
    public void dateChanged(DateEvent e) { 
     datum = sdf.format(e.getSelectedDate().getTime()); 
    } 
} 

非常感謝。

Answer 1

這是您的解決方案。我希望你可以在你的組件（JCalendar）中使用這種方法。

import javax.swing.JList; 
import javax.swing.JOptionPane; 
import javax.swing.JScrollPane; 
import javax.swing.SwingUtilities; 
import javax.swing.event.ListSelectionEvent; 
import javax.swing.event.ListSelectionListener; 

public class ListOptionTest { 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       String[] data = new String[10]; 
       for (int i = 0; i < 10; i++) { 
        data[i] = "Item " + (i + 1); 
       } 
       final JList<String> list = new JList<>(data); 
       list.addListSelectionListener(new ListSelectionListener() { 

        @Override 
        public void valueChanged(ListSelectionEvent e) { 
         if (!e.getValueIsAdjusting()) { 
          System.out.println("Current selection: " + list.getSelectedValuesList()); 
         } 
        } 
       }); 
       int result = JOptionPane.showConfirmDialog(null, new JScrollPane(list), "Make your choice", 
         JOptionPane.OK_CANCEL_OPTION); 
       if (result == JOptionPane.OK_OPTION) { 
        System.out.println("Final selection: " + list.getSelectedValuesList()); 
       } else { 
        System.out.println("No choice"); 
       } 
      } 
     }); 
    } 
}