public EC2SecurityGroup withEC2SecurityGroupId(String eC2SecurityGroupId) {
        setEC2SecurityGroupId(eC2SecurityGroupId);
        return this;
    }
<p>
Specifies the id of the EC2 security group.
</p>

@param eC2SecurityGroupId
       Specifies the id of the EC2 security group.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/EC2SecurityGroup.java