public DescribeClusterParameterGroupsResult withParameterGroups(ClusterParameterGroup... parameterGroups) {
        if (this.parameterGroups == null) {
            setParameterGroups(new com.amazonaws.internal.SdkInternalList<ClusterParameterGroup>(parameterGroups.length));
        }
        for (ClusterParameterGroup ele : parameterGroups) {
            this.parameterGroups.add(ele);
        }
        return this;
    }
<p>
A list of <a>ClusterParameterGroup</a> instances. Each instance describes one cluster parameter group.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setParameterGroups(java.util.Collection)} or {@link #withParameterGroups(java.util.Collection)} if you
want to override the existing values.
</p>

@param parameterGroups
       A list of <a>ClusterParameterGroup</a> instances. Each instance describes one cluster parameter group.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-redshift/src/main/java/com/amazonaws/services/redshift/model/DescribeClusterParameterGroupsResult.java