Method of

corpus/java/training/guava/base/Optional.java:106–108

Returns an Optional instance containing the given non-null reference. To have null treated as #absent, use #fromNullable instead. Comparison to java.util.Optional: no differences. @throws NullPointerException if reference is null

(T reference)

   * @throws NullPointerException if {@code reference} is null
   */
  public static <T> Optional<T> of(T reference) {
    return new Present<T>(checkNotNull(reference));
  }

  /**
   * If {@code nullableReference} is non-null, returns an {@code Optional} instance containing that