public void setUserName(String userName) {
        this.userName = userName;
    }
<p>
The name of the user to create.
</p>
<p>
IAM user, group, role, and policy names must be unique within the account. Names are not distinguished by case.
For example, you cannot create resources named both "MyResource" and "myresource".
</p>

@param userName
       The name of the user to create.</p>
       <p>
       IAM user, group, role, and policy names must be unique within the account. Names are not distinguished by
       case. For example, you cannot create resources named both "MyResource" and "myresource".
aws-java-sdk-iam/src/main/java/com/amazonaws/services/identitymanagement/model/CreateUserRequest.java