public void setWorkflowId(String workflowId) {
        this.workflowId = workflowId;
    }
<p>
The <code>workflowId</code> of the external workflow to which the cancel request was to be delivered.
</p>

@param workflowId
       The <code>workflowId</code> of the external workflow to which the cancel request was to be delivered.
aws-java-sdk-simpleworkflow/src/main/java/com/amazonaws/services/simpleworkflow/model/RequestCancelExternalWorkflowExecutionFailedEventAttributes.java