public java.lang.String getChannelId() {
      java.lang.Object ref = channelId_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        channelId_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Required. The ID of the channel resource to be created.
This value must be 1-63 characters, begin and end with `[a-z0-9]`,
could contain dashes (-) in between.
</pre>

<code>string channel_id = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The channelId.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/CreateChannelRequest.java