爪哇，结束了一个JFrame

Question

所以我一直在想出一个游戏的想法，而且一个需要在整个时间旅行。所以我写了一个JFrame来显示一个螺旋的.gif文件，但是当对话框出现时它不会结束，而是留在后台。我能解决这个问题吗？

import java.awt.*; 
import java.net.*; 
import javax.swing.*; 

public class Game { 
public static void main(String[] args) throws MalformedURLException { 

    URL url = new URL("https://s-media-cache-ak0.pinimg.com/originals/e8/e4/02/e8e4028941eb06f2fd5c10f44bfc5e1b.gif"); 
    Icon icon = new ImageIcon(url); 
    JLabel label = new JLabel(icon); 

    JFrame f = new JFrame("Trippy"); 
    f.getContentPane().add(label); 
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    f.pack(); 
    f.setLocationRelativeTo(null); 
    f.setVisible(true); 

    //This is the part i want the .gif to end. Instead, it just runs in the background. 

    JOptionPane.showMessageDialog(null, "You have traveled through space and time!"); 
} 

}

Answer 1

首先，defaultCloseOperation更改为类似DO_NOTHING_ON_CLOSE，这将至少阻止关闭窗口的用户，并从当你处理帧自己已经退出停止JVM。

接下来，在短暂的延迟之后（因为效果是真的很酷），你要拨打的框架dispose以关闭它。

为了达到这个目的，你可以使用一个Swing Timer，例如...

import java.awt.EventQueue; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.net.MalformedURLException; 
import java.net.URL; 
import javax.swing.Icon; 
import javax.swing.ImageIcon; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JOptionPane; 
import javax.swing.Timer; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 

public class Game { 

    public static void main(String[] args) { 
     new Game(); 
    } 

    public Game() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
        ex.printStackTrace(); 
       } 

       try { 
        URL url = new URL("https://s-media-cache-ak0.pinimg.com/originals/e8/e4/02/e8e4028941eb06f2fd5c10f44bfc5e1b.gif"); 
        Icon icon = new ImageIcon(url); 
        JLabel label = new JLabel(icon); 

        JFrame f = new JFrame("Trippy"); 
        f.getContentPane().add(label); 
        f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 
        f.pack(); 
        f.setLocationRelativeTo(null); 
        f.setVisible(true); 

        Timer timer = new Timer(5000, new ActionListener() { 
         @Override 
         public void actionPerformed(ActionEvent e) { 
          f.dispose(); 
          //This is the part i want the .gif to end. Instead, it just runs in the background. 
          JOptionPane.showMessageDialog(null, "You have traveled through space and time!"); 
         } 
        }); 
        timer.setRepeats(false); 
        timer.start(); 

       } catch (MalformedURLException exp) { 
        exp.printStackTrace(); 
       } 
      } 
     }); 
    } 
} 

看一看How to use Swing Timers了解更多详情。

你也应该考虑使用CardLayout减少你确实有窗口的数量，这会为一个更好的用户体验。