Method getAsDouble

gson/src/main/java/com/google/gson/JsonArray.java:277–280

Convenience method to get this array as a double if it contains a single element. This method calls {@link JsonElement#getAsDouble()} on the element, therefore any of the exceptions declared by that method can occur. @return this element as a double if it is single element array. @throws IllegalSta

()

   * @throws IllegalStateException if the array is empty or has more than one element.
   */
  @Override
  public double getAsDouble() {
    return getAsSingleElement().getAsDouble();
  }

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