code: @Deprecated
      protected UResourceBundle findTopLevel(String aKey) {
          // NOTE: this only works for top-level resources.  For resources at lower
          // levels, it fails when you fall back to the parent, since you're now
          // looking at root resources, not at the corresponding nested resource.
          for (UResourceBundle res = this; res != null; res = res.getParent()) {
              UResourceBundle obj = res.handleGet(aKey, null, this);
              if (obj != null) {
                  return obj;
              }
          }
          return null;
      }
docs: Returns a resource in a given resource that has a given key, or null if the
  resource is not found.
  
  @param aKey the key associated with the wanted resource
  @return the resource, or null
  @see #get(String)
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android