Java JOptionPane.showMessageDialog自定义图标问题？

Question

所以我的应用程序中有一个弹出对话框,告诉用户该程序.一切都很顺利,直到自定义图标.这是我尝试过的:

尝试1:

JOptionPane.showMessageDialog(dialog, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, new ImageIcon("home/user/Pictures/default.jpg"));

尝试2:

final icon = new ImageIcon("home/user/Pictures/default.jpg"));

    JOptionPane.showMessageDialog(dialog, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);

尝试3:

final icon = new ImageIcon("home/user/Pictures/default.jpg"));
showMessageDialog(dialog, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);

尝试4:

(尖叫着java)

尝试5:

使用URL

---

所有这些都没有影响程序,而不是图像,我没有得到任何东西.

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细节:

• 没有例外
• 文件路径存在
• 我的IDE不会返回异常,也不会返回任何类型的警告
• 是的,我已经尝试了路径/home/user/Pictures/default.jpg
• .ico的,.png的,.jpg是行不通的.我现在对.gif不太确定.

帮我!:(

Answer 1

这对我有用:

import javax.swing.*;

public class Test
{
    public static void main(String[] args)
    {
        final ImageIcon icon = new ImageIcon("C:\\Users\\John\\Desktop\\lol.jpg");
        JOptionPane.showMessageDialog(null, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);
    }
}

以下是使用URL的变体:

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

public class TestIcon
{
    public static void main(String[] args) throws Exception
    {
        final ImageIcon icon = new ImageIcon(new URL("http://www.gravatar.com/avatar/a1ab0af4997654345d7a949877f8037e?s=128&d=identicon&r=PG"));
        JOptionPane.showMessageDialog(null, "Blah blah blah", "About", JOptionPane.INFORMATION_MESSAGE, icon);
    }
}