Identify the Code-Smell?

Attention.md

Identify the Code Smells

• Can you identify the code-smell?
• How will you Refactor it?

Employee.java

public class Employee {
  private final Integer id;
  private final String name;
  
  public Employee(final Integer id, final String name) {
    this.id = id;
    this.name = name;
  }
  public String toString() { 
    return String.format("Employee(%d, %s)", id, name); 
  }
}

Filter.java

import java.util.ArrayList;
import java.util.List;

public class Filter {
    public static List<Integer> selectPerfect(List<Integer> numbers) {
        List<Integer> perfectNumbers = new ArrayList<>();
        for (Integer number : numbers) {
            if (isPerfect(number)) {
                perfectNumbers.add(number);
            }
        }
        return perfectNumbers;
    }
    private static boolean isPerfect(int number) {
        if (number > 0) {
	        List<Integer> factors = new ArrayList<>();
	        for (int i = 1; i <= number; i++) {
	            if (number % i == 0) {
	                factors.add(i);
	            }
	        }
	        // Sum of factors
	        int sumOfFactors = 0;
	        for (Integer i : factors) {
	            sumOfFactors += i;
	        }
	        // It is a perfect number if the difference between sum of factors and the
	        // number is equal to the number itself
	        return sumOfFactors - number == number;        	
        } 
        return false;
    }
	
    public static void main(String[] args) {
        List<Integer> numbers = List.of(-1, 0, 1, 2, 3, 4, 5, 6, 10, 28, 29);
        List<Integer> perfectNumbers = Filter.selectPerfect(numbers);
        System.out.println("perfectNumbers = " + perfectNumbers);		
    }
}

Sql.java

import java.sql.*;
import java.util.*;

public class Sql {
  public List<Employee> fetchEmployees(String driverFQN, String dburl) throws SQLException, ClassNotFoundException {
    Connection connection = null;
    Statement statement = null;
    ResultSet resultSet = null;
    List<Employee> employees = new ArrayList<Employee>();
    try {
      Class.forName(driverFQN);
      connection = DriverManager.getConnection(dburl);
      statement = connection.createStatement();
      statement.execute("select * from employee");
      resultSet = statement.getResultSet();
      while (resultSet.next()) {
        int empId = resultSet.getInt(0);
        String name = resultSet.getString(1); 
        employees.add(new Employee(empId, name));
      }
    } catch (SQLException e) { 
      e.printStackTrace(); 
    } finally {
      if (connection != null) {
        connection.close();
        if (statement != null) {
          statement.close();
          if (resultSet != null)
            resultSet.close();
        }
      }
    }
    return employees;    
  }
  
  public static void main(String[] args) throws Exception {
	  var sql = new Sql();
	  var employees = sql.fetchEmployees("com.mysql.jdbc.Driver", "jdbc:mysql://localhost:3306/test");
	  System.out.println("Got Employees = " + employees);
	  System.out.println("DONE");
  }
}