How to set up auto-incrementing id in PostgreSql table in Spring Boot with cleaning up deleted ids?

Question

PostgreSQL

I'm making a Java application with Spring Boot. PostgreSQL database. There is an html page that shows a table, the data is taken from a Postgresql table. After deleting/adding entries, the last row ID has a non-sequential number.
How to make the id numbers in the table go in order?
Is it possible to order the IDs using the spring annotation? Or do I need to write a special query in PostgreSql?

The class that creates the table:

import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;

@Data
@NoArgsConstructor
@Entity
@Table(name = "student")
public class Student {

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private int id;

  @Size(min = 3, max = 30)
  private String firstName;

  @Size(min = 3, max = 30)
  private String lastName;

  @NotBlank
  private String email;

  @NotBlank
  private String country;

  @NotBlank
  private String gender;

  @NotBlank
  private String section;

}

Answer 1

You don't need to do this. The whole point of identifiers is their immutability.

Answer 2

Thanks to everyone who answered my question!
My table in thymeleaf looks like this:

<table class="table table-bordered table-dark">

        </thead>
        <tbody>
            <tr>
                <th scope="col" >ID</th>
                <th scope="col">First Name</th>
                <th scope="col">Last Name</th>
                <th scope="col">Gender</th>
                <th scope="col">Email</th>
                <th scope="col">Section</th>
                <th scope="col">Country</th>
                <th scope="col">Edit</th>
                <th scope="col">Delete</th>
            </tr>

            <tr th:each="student, iStat : ${list}">
                <td th:text="${iStat.index + 1}"></td>
                <td th:text="${student.firstName}"></td>
                <td th:text="${student.lastName}"></td>
                <td th:text="${student.gender}"></td>
                <td th:text="${student.email}"></td>
                <td th:text="${student.section}"></td>
                <td th:text="${student.country}"></td>

                <td><a th:href="@{'/editstudent/' + ${student.id}}">Edit</a></td>
                <td><a th:href="@{'/deletestudent/' + ${student.id}}">Delete</a></td>
            </tr>

        </tbody>
    </table>

I just changed two lines in the thymeleaf template engine, it was like this:

<tr th:each="student : ${list}">
                <td th:text="${student.id}"></td>

became like this:

<tr th:each="student, iStat : ${list}">
                <td th:text="${iStat.index + 1}"></td>