java - 为什么 Java ImageIcon 不是 enter catch 子句？

Question

当我尝试创建 ImageIcon 时，出现此错误:

sun.awt.image.ImageFormatException: Unsupported color conversion request
at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
at sun.awt.image.JPEGImageDecoder.produceImage(Unknown Source)
at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
at sun.awt.image.ImageFetcher.run(Unknown Source)

如果发生此错误，那么我想加载另一个图像，所以我使用了 try-catch 方式:

  public Component getListCellRendererComponent(
        JList<?> list, Object value, int index, 
        boolean isSelected, boolean cellHasFocus ) 
{
    // Display the text for this item
    setText(value.toString());

    // Pre-load the graphics images to save time
    String iconurl=ABC.getCiconUrl();
    if(iconurl.isEmpty())
    {
        iconurl="img\\backgroundpic.png";
    }
    try {
        image = new ImageIcon(iconurl);
    } catch (Exception e) {
        image = new ImageIcon("img\\backgroundpic.png");
    }
    // Set the correct image
    setIcon( image );
    return this;
}

但即使发生错误，也不会跳入catch状态。为什么 ？

Answer 1

如果您查看堆栈跟踪，您会注意到其中没有列出您的任何函数。抛出异常的线程与运行代码的线程不同；它是一个负责为 ImageIcons 异步加载图像的线程，因此您无法捕获该异常