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Below is the code for the Game class, added as a separate driver to make a game window pop up. You can also download the .jar file to play the game yourself with the link below.

package game;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.geom.Rectangle2D;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import static javax.swing.JComponent.WHEN_IN_FOCUSED_WINDOW;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

public class Game {
public static void main(String[] args) {
new Game();
}

public Game() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}

JFrame frame = new JFrame("Philip Spring Final");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}

public static class TestPane extends JPanel {

Mario mario = new Mario();

protected static final int SPRITE_HEIGHT = 30;
protected static final int SPRITE_WIDTH = 30;
private int yPos; // The vertical position...
private int xPos; // The horizontal position...
private Timer engine;
JLabel damage1 = new JLabel("Most Recent Attack Result: ");
// modified later
JLabel damage2 = new JLabel("none, try pressing space!");
JLabel enemy = new JLabel("enemy");
JLabel player = new JLabel(mario.getName());
JLabel i1 = new JLabel("LEFT ARROW KEY to move left, RIGHT ARROW KEY to move right.");
JLabel i2 = new JLabel("SPACE to attack, ENTER for other actions.");
JLabel inv1 = new JLabel("Character Details:");
int height = 100;
JLabel inv2 = new JLabel(mario.toString());

public TestPane() {

xPos = (getPreferredSize().width - SPRITE_WIDTH) / 2;
yPos = getPreferredSize().height - SPRITE_HEIGHT;

InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
ActionMap am = getActionMap();

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), "right");
am.put("right", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
if (xPos <= 370) {
xPos = xPos + 5;
}
inv2.setText(mario.toString());
}
});

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "left");
am.put("left", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
if (xPos >= 0) {
xPos = xPos - 5;
}
inv2.setText(mario.toString());
}
});

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), "attack");
am.put("attack", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
try {
if (xPos >= 300) {
String hit = mario.attack(mario.getItemWithMaxAttack().substring(39).split("AKA")[0].trim());
damage2.setText(hit);
} else {
damage2.setText(mario.getName() + " missed the enemy! Try moving closer to it.");
}
inv2.setText(mario.toString());
} catch (Exception err) {
damage2.setText(mario.getName() + " does not have a weapon! Give them one by pressing enter.");
}
}
});

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "inv");
am.put("inv", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
String action = JOptionPane.showInputDialog("What would you like to do?\nTo add item to your inventory, type \"item\".\nTo clear your inventory, type \"clear\".\nTo change your name, type \"name\".\nTo change your base attack power, type \"base\".");
if (!(action.equals("item") || action.equals("name") || action.equals("base") || action.equals("clear"))) {
JOptionPane.showMessageDialog(null, "Invalid Input.");
inv2.setText(mario.toString());
} else {
switch(action) {
case "item":
double atk = Double.parseDouble(JOptionPane.showInputDialog("Give your item an attack power as a double or integer value."));
String alias = JOptionPane.showInputDialog("Enter aliases for your item separated by commas, with no spaces between the commas.\nExample: memes,dreams,john cena,cool thing");
mario.addItem(new InventoryItem(atk, false, alias.split(",")));
height += 15;
break;
case "clear":
mario.clearInventory();
height = 95;
break;
case "name":
String name = JOptionPane.showInputDialog("Type in a name, or type \"random\" to be assigned a random substring of your name as your new name.");
if (!(name.equals("random")))
mario.setName(name);
else
mario.giveMeAnotherName();
player.setText(mario.getName());
break;
case "base":
int baseatk = Integer.parseInt(JOptionPane.showInputDialog("What do you want your new base attack value to be? This determines the upper bound of your attack damage."));
mario.setAttack(baseatk);
break;
}
inv2.setText(mario.toString());
}
}
});

engine = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
repaint();
}
});
engine.start();
}

@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}

@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);

// Set the current color to red (setColor)
g.setColor(Color.RED);

// Obtain the rectanglar bounds of the text
FontMetrics metrics = g.getFontMetrics();
Rectangle2D strRect = metrics.getStringBounds("Java 2D!", g);

// Calculate the center of the screen
int centerPanelX = 100;
int centerPanelY = 100;

// Calculate the starting point for the centered string
int strX = centerPanelX - (int)(strRect.getWidth() / 2);
int strY = centerPanelY + (int)(strRect.getHeight() / 2);

// Draw x and y axis (drawLine)
g.drawLine(200, 0, 200, 400);
g.drawLine(0, 200, 400, 200);

// Draw the floor (drawRect)
g.setColor(Color.GREEN);
g.drawRect(0, 380, 400, 20);
g.fillRect(0, 380, 400, 20);

// Draw the sky (drawRect)
g.setColor(Color.CYAN);
g.drawRect(0, 0, 400, 380);
g.fillRect(0, 0, 400, 380);

// Draw enemy
g.setColor(Color.GRAY);
g.drawRect(330, 320, 60, 60);
g.fillRect(330, 320, 60, 60);

enemy.setBounds(340, 255, 100, 100);
super.add(enemy);

// draw ball
g.setColor(Color.RED);
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawOval(xPos, yPos - 15, SPRITE_WIDTH, SPRITE_HEIGHT);
g2d.fillOval(xPos, yPos - 15, SPRITE_WIDTH, SPRITE_HEIGHT);
g2d.dispose();

i1.setBounds(5, 5, 500, 20);
i2.setBounds(5, 20, 500, 20);
damage1.setBounds(5, 45, 200, 20);
damage2.setBounds(5, 60, 1000, 20);
super.add(i1);
super.add(i2);
super.add(damage1);
super.add(damage2);

inv1.setBounds(5, 85, 200, 20);
inv2.setBounds(5, 100, 1000, height);
super.add(inv1);
super.add(inv2);

player.setBounds(xPos, yPos - 50, 50, 50);
super.add(player);
}
}
}