Method add

output/java_guava/1.4.18/ImmutableSet.java:468–473

Adds element to the ImmutableSet. If the ImmutableSet already contains element, then add has no effect (only the previously added element is retained). @param element the element to add @return this Builder object @throws NullPointerException if {@co

(E element)

     */

    @CanIgnoreReturnValue
    @Override
    public Builder<E> add(E element) {
      super.add(element);
      return this;
    }

    /**
     * Adds each element of {@code elements} to the {@code ImmutableSet},