Program Code

--
TestGame.java
--
import javax.swing.JFrame;

public class TestGame extends JFrame {

    public TestGame() {

        add(new Board());

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(400, 300);
        setLocationRelativeTo(null);
        setTitle("Project Obcasus");
        setResizable(false);
        setVisible(true);
    }

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

--
Board.java
--
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JPanel;
import javax.swing.Timer;


public class Board extends JPanel implements ActionListener {

    private Timer timer;
    private Emilia emilia;

    public Board() {

        addKeyListener(new TAdapter());
        setFocusable(true);
        setBackground(Color.BLACK);
        setDoubleBuffered(true);

        emilia = new Emilia();

        timer = new Timer(5, this);
        timer.start();
    }


    public void paint(Graphics g) {
        super.paint(g);

        Graphics2D g2d = (Graphics2D)g;
        g2d.drawImage(emilia.getImage(), emilia.getX(), emilia.getY(), this);

        Toolkit.getDefaultToolkit().sync();
        g.dispose();
    }


    public void actionPerformed(ActionEvent e) {
        emilia.move();
        repaint();
    }


    private class TAdapter extends KeyAdapter {

        public void keyReleased(KeyEvent e) {
            emilia.keyReleased(e);
        }

        public void keyPressed(KeyEvent e) {
            emilia.keyPressed(e);
        }
    }

}

--
Emilia.java
--
import java.awt.Image;
import java.awt.event.KeyEvent;

import javax.swing.ImageIcon;

public class Emilia {

    private String emilia = "emiliasprite.png";

    private int dx;
    private int dy;
    private int x;
    private int y;
    private Image image;

    public Emilia() {
        ImageIcon ii = new ImageIcon(this.getClass().getResource(emilia));
        image = ii.getImage();
        x = 40;
        y = 60;
    }


    public void move() {
        x += dx;
        y += dy;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public Image getImage() {
        return image;
    }

    public void keyPressed(KeyEvent e) {

        int key = e.getKeyCode();

        if (key == KeyEvent.VK_A) {
            dx = -1;
        }

        if (key == KeyEvent.VK_D) {
            dx = 1;
        }

        if (key == KeyEvent.VK_W) {
            dy = -1;
        }


    }

    public void keyReleased(KeyEvent e) {
        int key = e.getKeyCode();

        if (key == KeyEvent.VK_A) {
            dx = 0;
        }

        if (key == KeyEvent.VK_D) {
            dx = 0;
        }

        if (key == KeyEvent.VK_W) {
            dy = 0;
        }
    }
}

--
ImageIcon.java Line 205
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        this(location, location.toExternalForm());