public class User {

    private Long id;
    private String userName;
    private Date createdAt;

    public Long getId() {
        return this.id;
    }

    public void setId(final Long id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Date getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(Date createdAt) {
        this.createdAt = createdAt;
    }

    @Override
    public String toString() {
        return "User{" + "id=" + id + ", userName=" + userName  + ", createdAt=" + createdAt + "}";
    }
}