In Java how do I find out what languages I have available my Resource Bundle

Question

I have some resource bundles packaged in my main jar

widget_en.properties
widget_de.properties

I retrieve a resource bundle based on my de

Answer 1

A solve it by listing files.

public class JavaApplication1 {

    public static final ArrayList LOCALES = new ArrayList<>();

    static {
        try {
            File f = new File(JavaApplication1.class.getResource("/l10n").toURI());
            final String bundle = "widget_";// Bundle name prefix.
            for (String s : f.list(new FilenameFilter() {
                @Override
                public boolean accept(File dir, String name) {
                    return name.startsWith(bundle);
                }
            })) {
                LOCALES.add(s.substring(bundle.length(), s.indexOf('.')));
            }
        } catch (URISyntaxException x) {
            throw new RuntimeException(x);
        }
        LOCALES.trimToSize();
    }

    ...

}