ایجاد ارتباط جاوا با MySQL با تعریف کردن یک کلاس

import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

public class MySQLCon {
    
    private Connection msCon = null;
    public static String ERROR = null;
   
    private MySQLCon(String database) {
        registerDriver(database);
    }

    private void registerDriver(String database){
        try{
            String url = "jdbc:mysql://localhost/";
            String driver = "com.mysql.jdbc.Driver";
            
            Class.forName(driver).newInstance();
            
            Properties property = new Properties();
            property.setProperty("user", "root");
            property.setProperty("password", "");
            // for farsi unicode 
            property.setProperty("useUnicode", "yes");
            property.setProperty("characterEncoding", "UTF-8");
            
            msCon = DriverManager.getConnection(url, property);   
            msCon.setCatalog(database);
            
        }catch(Exception e){
            ERROR = e.getMessage();
            msCon = null;
        }
    }

    public static MySQLCon getInstance(String database){
        return new MySQLCon(database); 
    }

    public Connection getConnection(){
        return msCon;
    }
}

MySQLCon obj = MySQLCon.getInstance("dbName");
Connection msCon = obj.getConnection();