public Builder setPromptTokenCount(int value) {

        promptTokenCount_ = value;
        bitField0_ |= 0x00000001;
        onChanged();
        return this;
      }
<pre>
Number of tokens in the request. When `cached_content` is set, this is
still the total effective prompt size meaning this includes the number of
tokens in the cached content.
</pre>

<code>int32 prompt_token_count = 1;</code>

@param value The promptTokenCount to set.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerateContentResponse.java