Changing JRadioButton Icon on Windows 7

Question

Hi

I created a method which changes the icon of all jradiobuttons from a buttongroup:

public void setRadioButtonIcons(final ButtonGroup gruppe){

        Enumeration<AbstractButton> gruppeEnum = gruppe.getElements();

    while (gruppeEnum.hasMoreElements()){
        AbstractButton radio = gruppeEnum.nextElement(); 
        Icon unselIcon = new ImageIcon( Thread.currentThread().getContextClassLoader().getResource("checkbox0.jpg").getPath()); 
        Icon selIcon = new ImageIcon( Thread.currentThread().getContextClassLoader().getResource("checkbox1.jpg").getPath());
        radio.setIcon(unselIcon); 
        radio.setSelectedIcon(selIcon);
    }

    }

This works fine under Ubuntu with Java 1.6.0_16.

When I use the methode under windows 7 with java 1.6.0_18, the icons do not apear. They are simply missing. The programm does not throw a Nullpointer... it finds the icons, but does not display them. Any ideas? It seems somewhat hard to believe that I can not use such a simple functionality under windows.

I tried it with gif and jpg. I also put the images inside the jar and tried to load them from the filesystem -> same result.

Edit: In this configuration, the files are loaded from the jar.

Answer 1

    Icon unselIcon = new ImageIcon( Thread.currentThread().getContextClassLoader().getResource("checkbox0.jpg").getPath()); 
    Icon selIcon = new ImageIcon( Thread.currentThread().getContextClassLoader().getResource("checkbox1.jpg").getPath());

You shouldn't be calling getPath() there, should just be:

    Icon unselIcon = new ImageIcon( Thread.currentThread().getContextClassLoader().getResource("checkbox0.jpg")); 
    Icon selIcon = new ImageIcon( Thread.currentThread().getContextClassLoader().getResource("checkbox1.jpg"));

It won't be able to access a resource in a jar by path and an ImageIcon can load an image using a URL just fine.

If you still are not seeing your icons then it may be that the L&F you are using does not use those icons and instead uses its own. Perhaps try testing the code with a different L&F.

Answer 2

Try removing the calls to getPath(), like this:

public void setRadioButtonIcons(final ButtonGroup gruppe) {
    Enumeration<AbstractButton> gruppeEnum = gruppe.getElements();
    while (gruppeEnum.hasMoreElements()){
        AbstractButton radio = gruppeEnum.nextElement(); 
        Icon unselIcon = new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("checkbox0.jpg")); 
        Icon selIcon = new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("checkbox1.jpg"));
        radio.setIcon(unselIcon); 
        radio.setSelectedIcon(selIcon);
    }
}

The problem is that URL.getPath() gives you a string URL, which isn't necessarily a valid string filename of the sort that the ImageIcon string constructor expects. Fortunately, ImageIcon has another constructor that understands URL objects, and so there's no need to call getPath().