Method getAsSingleElement

gson/src/main/java/com/google/gson/JsonArray.java:235–241

()

  }

  private JsonElement getAsSingleElement() {
    int size = elements.size();
    if (size == 1) {
      return elements.get(0);
    }
    throw new IllegalStateException("Array must have size 1, but has size " + size);
  }

  /**
   * Convenience method to get this array as a {@link Number} if it contains a single element. This