public ListRuleGroupsResult withRuleGroups(RuleGroupSummary... ruleGroups) {
        if (this.ruleGroups == null) {
            setRuleGroups(new java.util.ArrayList<RuleGroupSummary>(ruleGroups.length));
        }
        for (RuleGroupSummary ele : ruleGroups) {
            this.ruleGroups.add(ele);
        }
        return this;
    }
<p>
An array of <a>RuleGroup</a> objects.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setRuleGroups(java.util.Collection)} or {@link #withRuleGroups(java.util.Collection)} if you want to
override the existing values.
</p>

@param ruleGroups
       An array of <a>RuleGroup</a> objects.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-waf/src/main/java/com/amazonaws/services/waf/model/ListRuleGroupsResult.java