自動關閉對話框

Question

我有一個關於如何自動關閉對話框的問題，我可以用它在事件中提醒用戶並在延遲後自動關閉而不必關閉對話框？

public class ShutdownComputer 
{ 
    public static void main(String[]args) 
    { 
     int wholeTimeBeforeShutdown=0; 

     int hour=0; 
     int minute=0; 
     int second=0; 

     try 
     { 
      String a=JOptionPane.showInputDialog(null,"HOUR","HOUR BEFORE SHUTDOWN",JOptionPane.QUESTION_MESSAGE); 
      String b=JOptionPane.showInputDialog(null,"MINUTE","MINUTE BEFORE SHUTDOWN",JOptionPane.QUESTION_MESSAGE); 
      String c=JOptionPane.showInputDialog(null,"SECOND","SECOND BEFORE SHUTDOWN",JOptionPane.QUESTION_MESSAGE); 

      if((a==null)||(a.equals(""))) 
      { 
       a="0"; 
      } 

      if((b==null)||(b.equals(""))) 
      { 
       b="0"; 
      } 

      if((c==null)||(c.equals(""))) 
      { 
       c="0"; 
      } 

      int e=Integer.parseInt(a); 
      int f=Integer.parseInt(b); 
      int g=Integer.parseInt(c); 

      wholeTimeBeforeShutdown=wholeTimeBeforeShutdown+((e*60)*60); 
      wholeTimeBeforeShutdown=wholeTimeBeforeShutdown+(f*60); 
      wholeTimeBeforeShutdown=wholeTimeBeforeShutdown+(g); 

      wholeTimeBeforeShutdown=wholeTimeBeforeShutdown*1000; 


      Thread.sleep(wholeTimeBeforeShutdown); 

      JOptionPane.showMessageDialog(null, "You only have less than 2 minutes left"); 

      Runtime.getRuntime().exec("shutdown -r -f -t 120"); 
     } 
     catch(Exception exception) 
     { 
      exception.printStackTrace(); 
     } 
    } 
} 

Answer 1

可能您需要的是使用JOptionPane.setVisible（false）。我還沒有嘗試過，但http://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html底部的例子可以給你一個提示。

Answer 2

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.concurrent.TimeUnit; 

import javax.swing.JDialog; 
import javax.swing.JOptionPane; 
import javax.swing.Timer; 

...

final String msg="Shutdown\nWill happen automatically in "; 
    final JOptionPane op=new JOptionPane(null, JOptionPane.INFORMATION_MESSAGE); 
    final JDialog d=op.createDialog("Shutdown"); 
    d.setModal(true); 
    // deadline in three hours: 
    final long deadline=System.nanoTime()+TimeUnit.HOURS.toNanos(3); 
    ActionListener updater=new ActionListener() { 
     public void actionPerformed(ActionEvent e) 
     { 
     long left=deadline-System.nanoTime(); 
     if(left<=0) { 
      d.dispose(); 
      return; 
     } 
     String time; 
     long t=TimeUnit.NANOSECONDS.toHours(left); 
     if(t>0) time=t>1? t+" hours": "one hour"; 
     else { 
      t=TimeUnit.NANOSECONDS.toMinutes(left); 
      time=t>1? t+" minutes": "one minute"; 
     } 
     op.setMessage(msg+time); 
     } 
    }; 
    updater.actionPerformed(null);//update initial message 
    d.pack(); // resize dialog for the updated message 
    final Timer t=new Timer(1000, updater); 
    t.setInitialDelay(0); 
    t.setRepeats(true); 
    t.start(); 
    d.setVisible(true); 
    t.stop(); 
    // do your action 

請注意，此代碼所做的消息將四捨五入的時間值，但我認爲這是對你有用的起點。