public ModifyImageAttributeRequest withUserGroups(String... userGroups) {
        if (this.userGroups == null) {
            setUserGroups(new com.amazonaws.internal.SdkInternalList<String>(userGroups.length));
        }
        for (String ele : userGroups) {
            this.userGroups.add(ele);
        }
        return this;
    }
<p>
The user groups. This parameter can be used only when the <code>Attribute</code> parameter is
<code>launchPermission</code>.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setUserGroups(java.util.Collection)} or {@link #withUserGroups(java.util.Collection)} if you want to
override the existing values.
</p>

@param userGroups
       The user groups. This parameter can be used only when the <code>Attribute</code> parameter is
       <code>launchPermission</code>.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/ModifyImageAttributeRequest.java