code: public UResourceBundle get(String aKey) {
          UResourceBundle obj = findTopLevel(aKey);
          if (obj == null) {
              String fullName = ICUResourceBundleReader.getFullName(getBaseName(), getLocaleID());
              throw new MissingResourceException(
                      "Can't find resource for bundle " + fullName + ", key "
                      + aKey, this.getClass().getName(), aKey);
          }
          return obj;
      }
docs: <strong>[icu]</strong> Returns a resource in a given resource that has a given key.
  
  @param aKey               a key associated with the wanted resource
  @return                  a resource bundle object representing the resource
  @throws MissingResourceException If resource bundle is missing.