Hello! I want to create a program called snake game in java but I cannot figure out it. Did I miss something?

namespace Snake { package com.zetcode;

import java.awt.EventQueue; import javax.swing.JFrame; public class Snake extends JFrame {

public Snake() {

initUI(); }

private void initUI() { add(new Board());

setResizable(false); pack();

setTitle("Snake"); setLocationRelativeTo(null); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }

public static void main(String[] args) {

EventQueue.invokeLater(()-> { JFrame ex = new Snake(); ex.setVisible(true); }); } };