public void setPrevious(java.util.Collection<String> previous) {
        if (previous == null) {
            this.previous = null;
            return;
        }

        this.previous = new java.util.ArrayList<String>(previous);
    }
<p>
The previous step.
</p>

@param previous
       The previous step.
aws-java-sdk-migrationhuborchestrator/src/main/java/com/amazonaws/services/migrationhuborchestrator/model/UpdateWorkflowStepRequest.java