---src
    ---application
        |   Main.java
        |
        +---controller
        |       login.java
        |       register.java
        |
        +---database
        |       database.java
        |
        +---model
        |       user.java
        |
        ---view
                login.fxml
                register.fxml

package application.database;

import java.sql.*;

public class database {

    public static Connection conn;
    public static String dbName = "practice";
    public static String user = "root";
    public static String password = "";
    public static String url = "jdbc:mysql://localhost/" + dbName;

    public database(){
        try {
            conn = DriverManager.getConnection(url, user, password);
            System.out.println("Connection successfull");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

database db = new database();
Statement stm = db.createStatement();

Error:(22, 27) java: cannot find symbol
  symbol:   method createStatement()
  location: variable db of type application.database.database