code: @Deprecated
      public static boolean isSingleField(String skeleton) {
          char first = skeleton.charAt(0);
          for (int i = 1; i < skeleton.length(); ++i) {
              if (skeleton.charAt(i) != first) return false;
          }
          return true;
      }
docs: Determines whether a skeleton contains a single field
  
  @param skeleton The skeleton to determine if it contains a single field.
  @return true or not
  @deprecated This API is ICU internal only.
  @hide original deprecated declaration
  @hide draft / provisional / internal are hidden on Android