Empty screen, finally made the project file/folder layout that I'll be using until we finish the project

src/main/java/dev/dvorakmortonxd/Game.java

@@ -0,0 +1,52 @@
+package dev.dvorakmortonxd;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class Game extends JPanel implements ActionListener {
+
+    // this defines the window dimensions
+    public final int windowWidth = 800;
+    public final int windowHeight = 600;
+
+    // sets the fps to 30 (1000/30 = around 33)
+    public Timer timer = new Timer(33, this);
+
+    // defines the current scene
+    public String scene = "main_menu";
+
+    // routes to Update.java (actions)
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        Update.performPerTick(this);
+    }
+
+    // routes to Update.java (rendering)
+    @Override
+    public void paintComponent(Graphics g) {
+        super.paintComponent(g);
+        Update.paint(this, g);
+    }
+
+    // sets up the window and everything
+    public Game() {
+        //sets up the window size
+        setPreferredSize(new Dimension(windowWidth, windowHeight));
+        Input in = new Input(this);
+        addKeyListener(in);
+        setBackground(new Color(45, 73, 45));
+        setFocusable(true);
+        timer.start();
+    }
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("My cool retro game");
+        frame.setResizable(false); // NOT resizable
+        frame.add(new Game());
+        frame.pack();
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // enables the X button in the title bar
+        frame.setLocationRelativeTo(null); // centers the window
+        frame.setVisible(true); // duh
+    }
+}

src/main/java/dev/dvorakmortonxd/Input.java

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+package dev.dvorakmortonxd;
+
+import java.awt.event.*;
+
+public class Input implements KeyListener {
+    private final Game m;
+    public Input(Game m) {
+        this.m = m;
+    }
+    // what happens when you PRESS a key on your keyboard
+    @Override
+    public void keyPressed(KeyEvent e) {
+        switch (e.getKeyCode()) {
+            case KeyEvent.VK_ESCAPE -> System.exit(0);
+            case KeyEvent.VK_SPACE -> System.out.println("Hello world!");
+        }
+    }
+    // what happens when you RELEASE a key on your keyboard
+    @Override
+    public void keyReleased(KeyEvent e) {
+        switch (e.getKeyCode()) {
+            case KeyEvent.VK_SPACE -> System.out.println("Goodbye world!");
+        }
+    }
+    // I don't know what this is, or why it exists, I'll never use it but if this wasn't in the code, it'll throw an error.
+    @Override
+    public void keyTyped(KeyEvent e) {}
+}

src/main/java/dev/dvorakmortonxd/Main.java

@@ -1,17 +0,0 @@
-package dev.dvorakmortonxd;
-
-//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
-// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
-public class Main {
-    public static void main(String[] args) {
-        //TIP Press <shortcut actionId="ShowIntentionActions"/> with your caret at the highlighted text
-        // to see how IntelliJ IDEA suggests fixing it.
-        System.out.printf("Hello and welcome!");
-
-        for (int i = 1; i <= 5; i++) {
-            //TIP Press <shortcut actionId="Debug"/> to start debugging your code. We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint
-            // for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.
-            System.out.println("i = " + i);
-        }
-    }
-}

src/main/java/dev/dvorakmortonxd/update.java

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+package dev.dvorakmortonxd;
+
+import java.awt.*;
+
+public class Update {
+    static void performPerTick(Game m) {
+        m.repaint();
+    }
+    static void paint(Game m, Graphics g) {
+        Toolkit.getDefaultToolkit().sync();
+    }
+}