public void setRunId(String runId) {
        this.runId = runId;
    }
<p>
The <code>runId</code> of the external workflow execution to cancel.
</p>

@param runId
       The <code>runId</code> of the external workflow execution to cancel.
aws-java-sdk-simpleworkflow/src/main/java/com/amazonaws/services/simpleworkflow/model/RequestCancelExternalWorkflowExecutionDecisionAttributes.java