public void setUsers(java.util.Collection<String> users) {
        if (users == null) {
            this.users = null;
            return;
        }

        this.users = new java.util.ArrayList<String>(users);
    }
<p>
A list of users to be attached. There must be at least one user.
</p>

@param users
       A list of users to be attached. There must be at least one user.
aws-java-sdk-budgets/src/main/java/com/amazonaws/services/budgets/model/IamActionDefinition.java