Select com PreparedStatement

package Conexões;

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

public class teste {
   
    public static void main( String agrs[] ) {
        Scanner input = new Scanner( System.in);
        VO.Estado estado = new VO.Estado("MG","Minas Gerais");
        String hostName = "localhost:3306";
        String userName = "root";
        String userPassword = "bruno";
        String dataBase = "projeto";
        String driver = "com.mysql.jdbc.Driver";
        String url = "jdbc:mysql://" + hostName + "/" + dataBase;
        String SQL;
        Connection conn = null;
        PreparedStatement pstm;
        ResultSet rs;
        int codEstado;
        try {
            Class.forName(driver);
            conn = DriverManager.getConnection (url,userName,userPassword);
        }catch(Exception ex) {
            ex.printStackTrace();
        }
       
       
        System.out.println("Digite o codigo do Estado");
        codEstado = input.nextInt();
       
       
        SQL = "SELECT UF,estado FROM estado WHERE codEstado = ?";
        try {
            pstm = conn.prepareStatement(SQL);
            pstm.setInt(1,codEstado);
            rs = pstm.executeQuery(SQL);
        }catch(SQLException sqlex) {
            sqlex.printStackTrace();
        }
    }
   
}