网址加载错误

Question

所以，当我尝试下面的代码：

//Main Class 

package com.mgflow58.Main; 

import java.awt.image.BufferedImage; 
import java.io.IOException; 
import java.net.MalformedURLException; 
import java.net.URL; 

import javax.imageio.ImageIO; 
import javax.swing.ImageIcon; 
import javax.swing.JFrame; 

public class Game { 

    public static void main(String[] args) { 
     BufferedImage mainicon = null; 
     JFrame window = new JFrame("Guppy's Adventure"); 
     window.add(new GamePanel()); 
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     window.setResizable(false); 
     window.pack(); 
     window.setLocationRelativeTo(null); 
     window.setVisible(true); 

     try { 
      String mainurlstring = "icon.gif"; 
      URL mainurl = new URL(mainurlstring); 
      try { 
       mainicon = ImageIO.read(mainurl); 
       window.setIconImage(new ImageIcon(mainicon).getImage()); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
     } catch (MalformedURLException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

    } 

} 

我得到以下错误：

java.net.MalformedURLException: no protocol: icon.gif 
    at java.net.URL.<init>(Unknown Source) 
    at java.net.URL.<init>(Unknown Source) 
    at java.net.URL.<init>(Unknown Source) 
    at com.mgflow58.Main.Game.main(Game.java:28) 

文件icon.gif是在根文件夹，我甚至试图将它复制到执行代码的类所在的src/com/mgflow58/Main中。我做错了什么？无论我尝试使用哪种方法，我都无法设置图像图标，而且我一直在努力寻找答案。

Answer 1

我已简化了上一个问题的答案。我在某个地方犯了一个愚蠢的错误，但是现在我重新写了一行，并且问题得到了解决。这是我如何访问icon.gif：

//Main Class 

package com.mgflow58.Main; 

import java.awt.image.BufferedImage; 
import java.io.File; 
import java.io.IOException; 
import java.net.MalformedURLException; 
import java.net.URL; 

import javax.imageio.ImageIO; 
import javax.swing.ImageIcon; 
import javax.swing.JFrame; 

public class Game { 

    public static void main(String[] args) { 
     BufferedImage mainicon = null; 
     JFrame window = new JFrame("Guppy's Adventure"); 
     window.add(new GamePanel()); 
     window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     window.setResizable(false); 
     window.pack(); 
     window.setLocationRelativeTo(null); 
     window.setVisible(true); 

     window.setIconImage(new ImageIcon(Game.class.getResource("/icon.gif")).getImage()); 

    } 

}