Main.java

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

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class Main extends JFrame{
	
	private JPanel jContentPane	= null;
	private Canvas canvas		= null;

	public static void main(String[] args) {
		
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				Main thisClass = new Main();
				thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				thisClass.setVisible(true);
			}
		});
		
	}//end of main() method

	public Main(){
		super();
		initialize();
	}//end of constructor

	private void initialize() {
		this.setTitle("My Window");
		this.setSize(800, 600);
		this.setVisible(true);	
		this.setContentPane(getJContentPane());
	}//end of initialize() method	
	
	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new JPanel();
			jContentPane.setLayout(new BorderLayout());
			jContentPane.add(getCanvas(), BorderLayout.CENTER);
		}
		return jContentPane;
	}
	
	private Canvas getCanvas() {
		if(canvas==null){
			canvas	= new Canvas();
		}
		return canvas;
	}
	
	class Canvas extends JComponent implements Runnable{
		
		private Thread	thread;
		private volatile boolean running;
		private final static int	MAX_FPS 		= 60;
		private final static int	MAX_FRAME_SKIPS = 5;
		private final static int	FRAME_PERIOD 	= 1000 / MAX_FPS;	
				
		public Canvas(){
			resume();
		}
		
		public void resume() {
			thread	= new Thread(this);
			running	= true;
			thread.start();			
		}
		
		public void pause(){
			running = false;
	        try {
	            thread.join();
	        } catch (InterruptedException e) {
	            e.printStackTrace();
	        }
		}
		
		public void exit(){
			running	= false;
			System.exit(0);
		}

		@Override
		public void run() {		
			long beginTime;
			long timeDiff;		
			int sleepTime	= 0;
			int framesSkipped;	
			/*loop*/
			while (running) {
				try {
					beginTime = System.currentTimeMillis();
					framesSkipped = 0;
					synchronized(this){					
						update();
						repaint();					
					}
					timeDiff = System.currentTimeMillis() - beginTime;
					sleepTime = (int)(FRAME_PERIOD - timeDiff);
					if (sleepTime > 0) {
						try {
							thread.sleep(sleepTime);	
						} catch (InterruptedException e) {}
					}				
					while (sleepTime < 0 && framesSkipped < MAX_FRAME_SKIPS) {
						update();
						sleepTime += FRAME_PERIOD;	
						framesSkipped++;
					}			
				}finally{}
			}		
		}

		private void update() {
			//method untuk memperbaharui variabel
			
		}

		@Override
		public void paint(Graphics g) {
			super.paint(g);
			Graphics2D g2d = (Graphics2D) g;
			g2d.setColor(Color.WHITE);
			g2d.fillRect(0, 0, getWidth(), getHeight());
			//tempat untuk menggambar di atas canvas
			g2d.setColor(Color.decode("#3498db"));
			int lebarKotak	= 46;
			for(int i=0;i<12;i++){
				for(int j=0;j<17;j++){
					int x	= j*lebarKotak;
					int y	= i*lebarKotak;
					g2d.fillRect(x+2, y+2, lebarKotak-2, lebarKotak-2);
				}
			}
			g2d.dispose();
		}
		
	}//end of class Canvas

}//end of class Main