public java.util.List<ClusterParameterGroup> getParameterGroups() {
        if (parameterGroups == null) {
            parameterGroups = new com.amazonaws.internal.SdkInternalList<ClusterParameterGroup>();
        }
        return parameterGroups;
    }
<p>
A list of <a>ClusterParameterGroup</a> instances. Each instance describes one cluster parameter group.
</p>

@return A list of <a>ClusterParameterGroup</a> instances. Each instance describes one cluster parameter group.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/DescribeClusterParameterGroupsResult.java