@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getClusterArn() != null)
            sb.append("ClusterArn: ").append(getClusterArn()).append(",");
        if (getConfigurationInfo() != null)
            sb.append("ConfigurationInfo: ").append(getConfigurationInfo()).append(",");
        if (getCurrentVersion() != null)
            sb.append("CurrentVersion: ").append(getCurrentVersion()).append(",");
        if (getTargetKafkaVersion() != null)
            sb.append("TargetKafkaVersion: ").append(getTargetKafkaVersion());
        sb.append("}");
        return sb.toString();
    }
Returns a string representation of this object. This is useful for testing and debugging. Sensitive data will be
redacted from this string using a placeholder value.

@return A string representation of this object.

@see java.lang.Object#toString()
aws-java-sdk-kafka/src/main/java/com/amazonaws/services/kafka/model/UpdateClusterKafkaVersionRequest.java