public UpdateChannelMessageRequest withContentType(String contentType) {
        setContentType(contentType);
        return this;
    }
<p>
The content type of the channel message.
</p>

@param contentType
       The content type of the channel message.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-chimesdkmessaging/src/main/java/com/amazonaws/services/chimesdkmessaging/model/UpdateChannelMessageRequest.java