import sun.util.locale.provider.JRELocaleProviderAdapter; //导入依赖的package包/类
@Override
 public List<Locale> getCandidateLocales(String baseName, Locale locale) {
    List<Locale> candidates = super.getCandidateLocales(baseName, locale);
    // Weed out Locales which are known to have no resource bundles
    int lastDot = baseName.lastIndexOf('.');
    String category = (lastDot >= 0) ? baseName.substring(lastDot + 1) : baseName;
    LocaleProviderAdapter.Type type = baseName.contains(DOTCLDR) ? CLDR : JRE;
    LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);
    Set<String> langtags = ((JRELocaleProviderAdapter)adapter).getLanguageTagSet(category);
    if (!langtags.isEmpty()) {
        for (Iterator<Locale> itr = candidates.iterator(); itr.hasNext();) {
            if (!LocaleProviderAdapter.isSupportedLocale(itr.next(), type, langtags)) {
                itr.remove();
            }
        }
    }

    // Force fallback to Locale.ENGLISH for CLDR time zone names support
    if (locale.getLanguage() != "en"
            && type == CLDR && category.equals("TimeZoneNames")) {
        candidates.add(candidates.size() - 1, Locale.ENGLISH);
    }
    return candidates;
}
 

import sun.util.locale.provider.JRELocaleProviderAdapter; //导入依赖的package包/类
@Override
public List<Locale> getCandidateLocales(String baseName, Locale locale) {
    String key = baseName + '-' + locale.toLanguageTag();
    List<Locale> candidates = CANDIDATES_MAP.get(key);
    if (candidates == null) {
        LocaleProviderAdapter.Type type = baseName.contains(DOTCLDR) ? CLDR : JRE;
        LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);
        candidates = adapter instanceof ResourceBundleBasedAdapter ?
            ((ResourceBundleBasedAdapter)adapter).getCandidateLocales(baseName, locale) :
            defaultControl.getCandidateLocales(baseName, locale);

        // Weed out Locales which are known to have no resource bundles
        int lastDot = baseName.lastIndexOf('.');
        String category = (lastDot >= 0) ? baseName.substring(lastDot + 1) : baseName;
        Set<String> langtags = ((JRELocaleProviderAdapter)adapter).getLanguageTagSet(category);
        if (!langtags.isEmpty()) {
            for (Iterator<Locale> itr = candidates.iterator(); itr.hasNext();) {
                if (!adapter.isSupportedProviderLocale(itr.next(), langtags)) {
                    itr.remove();
                }
            }
        }
        // Force fallback to Locale.ENGLISH for CLDR time zone names support
        if (locale.getLanguage() != "en"
                && type == CLDR && category.equals("TimeZoneNames")) {
            candidates.add(candidates.size() - 1, Locale.ENGLISH);
        }
        CANDIDATES_MAP.putIfAbsent(key, candidates);
    }
    return candidates;
}