GamePanel.java

//lala lalai lalai lala lai lai

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JPanel;


public class GamePanel extends JPanel implements Runnable {

	final int originalTileSize = 16;
	final int scale = 3;
	public final int tileSize = originalTileSize * scale;
	final int maxScreenCol = 30;
	final int maxScreenRow = 20;
	final int screenWidth = tileSize * maxScreenCol;
	final int screenHeigth = tileSize * maxScreenRow;

	int FPS = 50;


	TileManager tileM = new TileManager(this);
	KeyHandler keyH = new KeyHandler();

	Thread gameThread;

	Monster monster = new Monster(this);

	Player player = new Player(this, keyH);

	Axe axe = new Axe(this);
	public UI ui = new UI(this);


	public GamePanel() {

		this.setPreferredSize(new Dimension(screenWidth, screenHeigth));
		this.setBackground(Color.black);
		this.setDoubleBuffered(true);
		this.addKeyListener(keyH);
		this.setFocusable(true);
	}

	public void startGameThread() {
		gameThread = new Thread(this);
		gameThread.start();
	}

	@Override

	public void run() {

		double drawInterval = 1000000000 / FPS;
		double nextDrawTime = System.nanoTime() + drawInterval;

		while(gameThread != null) {

			update();
			repaint();

			try {
				double remainingTime = nextDrawTime - System.nanoTime();
				remainingTime = remainingTime / 1000000;

				if (remainingTime < 0) 
					remainingTime = 0;

				Thread.sleep((long)remainingTime);

				nextDrawTime += drawInterval;
			}
			catch (InterruptedException e) {
				e.printStackTrace();
			}
		}

	}

	public void update() {
		player.update();
		axe.update();
	}

	public void paintComponent(Graphics g) {

		super.paintComponent(g);
		Graphics2D g2 = (Graphics2D) g;

		tileM.draw(g2);

		player.draw(g2);

		//ui.draw_sad(g2);

		monster.draw(g2, true);

		axe.draw(g2);

		g2.dispose();
	}
}