public void setGroupName(String groupName) {
        this.groupName = groupName;
    }
<p>
[Default VPC] The name of the security group. For a security group in a nondefault VPC, use the security group
ID.
</p>
<p>
For a referenced security group in another VPC, this value is not returned if the referenced security group is
deleted.
</p>

@param groupName
       [Default VPC] The name of the security group. For a security group in a nondefault VPC, use the security
       group ID. </p>
       <p>
       For a referenced security group in another VPC, this value is not returned if the referenced security
       group is deleted.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/UserIdGroupPair.java