[JAVA] how to connect mysql on java

/****[SOURCE CODE]*****/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class test_koneksi {
    public static Connection con;
    public static Statement stm;
    public static void main (String args[]){

        try{
            String url="";//ip database server + ("pake slash / ") nama database ex : jdbc:mysql://localhost/db_test_koneksi
            String user="";//isi sesuai dengan user yang di pakai ex :root
            String pass="";//isi sesuai dengan passoword usernya ex : 12345678 atau , jika kosong passwordnya ; tidak usah di isi
            Class.forName("com.mysql.jdbc.Driver");
            con =DriverManager.getConnection(url,user,pass);
            stm = con.createStatement();
            System.out.println("koneksi berhasil : ");
        }
        catch (Exception e){

            System.err.println("koneksi gagal : "+e.getMessage());

        }

    }
}


tested with :
mysql :  v14.14 Distrib 5.7.20, for Linux (x86_64)
java : openjdk version 1.8.0_151

codding with :
BlueJ : v4.1.2



REF : https://www.malasngoding.com/cara-menghubungkan-java-dengan-database-mysql/