Conexão MySQL

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Conexao {
public static void main(String[] args) throws Exception{
String url = "jdbc:mysql://localhost:3306/aj";
String user = "root";
String password = "root";
String driver = "com.mysql.jdbc.Driver";
String sql = "select ID from CLIENTE";
try{
Class.forName(driver);
Connection conn = DriverManager.getConnection(url, user,
password);
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql);
while( rs.next()) {
System.out.println(rs.getString("ID"));
System.out.println(rs.getString("DESCRICAO"));
}
}
catch(SQLException e){
e.printStackTrace();
System.out.println(e.getMessage());

}
//st.execute(sql);
//st.close();
//conn.close();
}
}