Simulator for a program

 import java.sql.Connection;
        import java.sql.DriverManager;
        import java.sql.SQLException;
        public class ConnectDatabase {
    private Connection conn;
    public ConnectDatabase(){
        conn = null;
        connectToDatabase();
    }
    private void connectToDatabase(){
        String url = "jdbc:mariadb://localhost:3306/lotto";        
        try{
            conn = DriverManager.getConnection(url,"root","");
        }catch(SQLException ex){
            ex.printStackTrace();
        }
    }

    public void closeConnect(){
        try{
            if(conn != null){
                conn.close();
            }
        }catch(SQLException ex){
            ex.printStackTrace();
        }
    }
    public Connection getConnection(){
        return conn;
    }
}

1.Reader

import java.util.Scanner;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.util.Vector;

public class Reader {
    public Reader(){

    }
    public Vector<String>readFile(){
        Vector<String> numbers = new Vector<>();
        
        try {
            FileReader fRead = new FileReader("szamok.txt");
            Scanner scan = new Scanner(fRead);
            while(scan.hasNext()){
                String row = scan.nextLine();
                if(row.matches("[0-9:]+")){
                    numbers.add(row);
                }
            }
            scan.close();
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        }
        return numbers;
    }
}

1. Main
import java.util.Vector;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.SQLException;

public class Lotto {
     private static Vector<String> numbers;
    public static void main(String[] args) throws Exception {
        
        numbers = new Vector<>();
        Reader reader = new Reader();
        numbers = reader.readFile();
        ConnectDatabase connDb = new ConnectDatabase();
        Connection conn = connDb.getConnection();
        numbers.forEach(rows -> rowsToDatabase(conn,rows));
    }
    private static void rowsToDatabase(Connection conn, String rows){
        String sql = "INSERT INTO drawed ( draw ) VALUES ('" + rows + "');";
        Statement stmt = null;
        try {
            stmt = conn.createStatement();
            stmt.executeQuery(sql);
        } catch (SQLException ex) {
            ex.printStackTrace();
            
        }
    }
}

 2.main
import java.sql.Connection;

public class Lotto {
    public static void main(String[] args) throws Exception {
        ConnectDatabase connDb = new ConnectDatabase();
        LottoController lottoCtr = new LottoController(connDb);

    }
}
2. controller
import java.util.Vector;
import java.util.Random;
import javax.swing.JCheckBox;
import javax.swing.JCheckBoxMenuItem;
import java.sql.Connection;
import java.sql.SQLDataException;
import java.sql.SQLException;
import java.sql.Statement;

public class LottoController {

    private ConnectDatabase connDb;
    private Vector<Integer> numberList;
    private Vector<Integer> drawedList;
    private Vector<Integer> choosenList;
    private Lottoform lottoFrm;
    private int counter = 0;

    public LottoController(ConnectDatabase connDb){
        choosenList = new Vector<>();
        drawedList = new Vector<>();
        numberList = new Vector<>();
        this.connDb = connDb;
        lottoFrm = new Lottoform();
        lottoFrm.exitBtn.addActionListener(event -> exit());
        lottoFrm.drwaBtn.addActionListener(event -> drawing());
        fillNumberList();
        numbercheckBoxes();
        lottoFrm.setVisible(true);
    }
    private void fillNumberList(){
        for(int i = 1; i < 91; i++  ){
            numberList.add(i);
        }
    }
    private void numbercheckBoxes(){
        
        for(Integer i = 1; i < 91; i++ ){
            JCheckBox box = new JCheckBox();
            box.setText(i.toString());
            lottoFrm.centerPnl.add(box);

            box.addItemListener(event -> {
                JCheckBox check = (JCheckBox) event.getSource();
                choosenList.add(Integer.parseInt(check.getText()));
                counter ++;
                if(counter == 5){
                    lottoFrm.drwaBtn.setEnabled(true);
                }else{
                    lottoFrm.drwaBtn.setEnabled(false);
                }
            });
        }
    }
    private void drawing(){
        int numbers = 90;
        Random rand = new Random();

        for(int i = 0; i < 5; i++){
            int number = rand.nextInt(numbers) + 1;
            numberList.remove(number - 1);
            numbers --;
            drawedList.add(number);
        }
        showResult();
        numberstoDatabase();
    }
    private void showResult(){
        Integer result = 0;
        for(int i = 0;i < choosenList.size(); i++){
            for(int j = 0; j < drawedList.size(); j++){
                if(choosenList.get(i) == drawedList.get(j)){
                    result ++;
                }
            }
        }
        String resultValue = lottoFrm.resultLbl.getText();
        lottoFrm.resultLbl.setText(resultValue + result.toString());

        
        for(int i = 0;i < drawedList.size(); i++){
            String drawValue = lottoFrm.drawLbl.getText();
            String number = String.valueOf(drawedList.get(i));
            lottoFrm.drawLbl.setText(drawValue + number + " ");
        }
    }
    private void numberstoDatabase(){
        Connection conn = connDb.getConnection();
        Statement stmt = null;
        String sqlData = "";
        for(int i = 0; i < drawedList.size(); i++){
            if(i < (drawedList.size() - 1)){
                sqlData += String.valueOf(drawedList.get(i)) + ":";
            }else{
                sqlData += String.valueOf(drawedList.get(i));
            }
        }
        System.out.println(sqlData);
        String sql = "INSERT INTO drawed(draw) VALUES ('"+ sqlData +"');";
        try {
            stmt = conn.createStatement();
            stmt.execute(sql);

        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }

    private void exit(){
        System.exit(0);
    }
    
}

2. Form
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.util.concurrent.Flow;
import java.awt.FlowLayout;

public class Lottoform extends JFrame{

    public JPanel mainPnl = new JPanel();
    public JPanel northPnl = new JPanel();
    public JPanel eastPnl = new JPanel();
    public JPanel westPnl = new JPanel();
    public JPanel southPnl = new JPanel();
    public JPanel centerPnl = new JPanel();
    public JPanel drawPnl = new JPanel();
    public JPanel buttonPnl = new JPanel();
    public JLabel drawLbl = new JLabel("Számok: ");
    public JLabel resultLbl = new JLabel("Találatok: ");
    public JButton exitBtn = new JButton("Kilépés");
    public JButton drwaBtn = new JButton("Húzás");
    

    public Lottoform(){
        initComponents();
        this.setVisible(true);
    }
    private void initComponents(){

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(450,400);
        this.setLayout(new GridLayout(1,1));
        mainPnl.setLayout(new BorderLayout());
        this.add(mainPnl);

        northPnl.setLayout(new FlowLayout(FlowLayout.CENTER));
        northPnl.add(resultLbl);
        mainPnl.add(northPnl,BorderLayout.NORTH);

        eastPnl.setSize(10,400);
        mainPnl.add(eastPnl,BorderLayout.EAST);

        southPnl.setLayout(new GridLayout(1,2));
        drawPnl.setLayout(new FlowLayout(FlowLayout.CENTER));
        drawPnl.add(drawLbl);
        buttonPnl.setLayout(new FlowLayout(FlowLayout.RIGHT));
        drwaBtn.setEnabled(false);
        buttonPnl.add(drwaBtn);
        buttonPnl.add(exitBtn);
        southPnl.add(drawPnl);
        southPnl.add(buttonPnl);
        mainPnl.add(southPnl,BorderLayout.SOUTH);

        westPnl.setSize(10,400);
        mainPnl.add(westPnl);

        centerPnl.setLayout(new GridLayout(10,9));
        mainPnl.add(centerPnl,BorderLayout.CENTER);
    }
}