import javax.swing.*;import java.net.URL;import java.awt.*;import java.io.*;import java.util.*;import javax.swing.SwingUtilities;// for dealing with the start stop buttonimport java.awt.event.ActionListener;import java.awt.event.ActionEvent;// for dealing with the delay sliderimport javax.swing.event.ChangeListener;import javax.swing.event.ChangeEvent;import java.awt.GridBagLayout;import java.awt.GridBagConstraints;public class DiningPhilosophers extends javax.swing.JApplet           implements ActionListener, ChangeListener {    // delays can go from 0 to 10,000 milliseconds, initial value is 500    public int grabDelay = 500;    private JButton stopStartButton = new JButton("start");    private JSlider grabDelaySlider = new JSlider(JSlider.HORIZONTAL, 0, 100, 5);    private JLabel label = new JLabel("  500 milliseconds");    private JPanel philosopherArea;    public Map<Dukes, ImageIcon> imgs;    static final int NUMPHILS = 5;    public Chopstick[] chopsticks = new Chopstick[NUMPHILS];    private Philosopher[] philosophers = new Philosopher[NUMPHILS];    String[] names = { "Arisduktle", "Dukrates", "Pythagoduke", 											"Duko", "Dukimedes" };    private int width = 0;    private int height = 0;    private double spacing;    private static final double MARGIN = 10.0f;		public void init() {			imgs = new EnumMap<Dukes, ImageIcon>(Dukes.class);			imgs.put(Dukes.HUNGRYDUKE, createAppletImageIcon("images/hungryduke.gif", "hungry duke"));			imgs.put(Dukes.RIGHTSPOONDUKE, createAppletImageIcon("images/rightspoonduke.gif", "right spoon duke"));			imgs.put(Dukes.BOTHSPOONSDUKE, createAppletImageIcon("images/bothspoonsduke.gif", "both spoon duke"));			width = imgs.get(Dukes.HUNGRYDUKE).getIconWidth() + (int)(MARGIN*2.0);			height = imgs.get(Dukes.HUNGRYDUKE).getIconHeight() + (int)(MARGIN*2.0);			spacing = width + MARGIN;						//Execute a job on the event-dispatching thread:			//creating this applet's GUI.			try {				javax.swing.SwingUtilities.invokeAndWait(new Runnable() {					public void run() {						createGUI();					}				});			} catch (Exception e) {				System.err.println("createGUI didn't successfully complete");			}		}				private void createGUI() {						GridBagLayout gridBag = new GridBagLayout();			GridBagConstraints c = new GridBagConstraints();						JPanel contentPane = new JPanel();			contentPane.setLayout(gridBag);						philosopherArea = new JPanel(null);			philosopherArea.setBackground(Color.white);			Dimension preferredSize = createPhilosophersAndChopsticks();			philosopherArea.setBorder(BorderFactory.createCompoundBorder(											BorderFactory.createLoweredBevelBorder(),											BorderFactory.createEmptyBorder(5, 5, 5, 5)			));			philosopherArea.setPreferredSize(preferredSize);						c.fill = GridBagConstraints.BOTH;			c.weighty = 1.0;			c.gridwidth = GridBagConstraints.REMAINDER; //end row			gridBag.setConstraints(philosopherArea, c);			contentPane.add(philosopherArea);						c.fill = GridBagConstraints.HORIZONTAL;			c.weightx = 1.0;			c.weighty = 0.0;			gridBag.setConstraints(stopStartButton, c);			contentPane.add(stopStartButton);						c.gridwidth = GridBagConstraints.RELATIVE; //don't end row			c.weightx = 1.0;			c.weighty = 0.0;			gridBag.setConstraints(grabDelaySlider, c);			contentPane.add(grabDelaySlider);						c.weightx = 0.0;			c.gridwidth = GridBagConstraints.REMAINDER; //end row			gridBag.setConstraints(label, c);			contentPane.add(label);			contentPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));			setContentPane(contentPane);						stopStartButton.addActionListener(this);			grabDelaySlider.addChangeListener(this);    }    public void actionPerformed(ActionEvent e) {        if ("stop/reset".equals(stopStartButton.getText())) {            stopPhilosophers();            stopStartButton.setText("start");        } else if ("start".equals(stopStartButton.getText())) {            startPhilosophers();            stopStartButton.setText("stop/reset");        }    }    public void stateChanged(ChangeEvent e) {        JSlider source = (JSlider)e.getSource();        grabDelay = source.getValue()*100;        label.setText(String.valueOf(grabDelay + " milliseconds"));    }    public void startPhilosophers() {        for (int i = 0; i < NUMPHILS; i++)            philosophers[i].philThread.start();    }    public void stopPhilosophers() {        for (int i = 0; i < NUMPHILS; i++)            philosophers[i].philThread.interrupt();    }    public Dimension createPhilosophersAndChopsticks() {        double x, y;        double radius = 80.0;        double centerAdj = 85.0;        double radians;        Dimension preferredSize = new Dimension(0, 0);        for (int i = 0; i < NUMPHILS; i++)            chopsticks[i] = new Chopstick();        for (int i = 0; i < NUMPHILS; i++) {            radians = i*(2.0 * Math.PI /(double)NUMPHILS);            x = Math.sin(radians) * radius + centerAdj;             y = Math.cos(radians) * radius + centerAdj;             philosophers[i] = new Philosopher(this, i);            philosophers[i].setBounds((int)x, (int)y, width, height);            philosopherArea.add(philosophers[i]);            if ((int)x > preferredSize.width)							preferredSize.width = (int)x;            if ((int)y > preferredSize.height)							preferredSize.height = (int)y;        }        preferredSize.width += width;        preferredSize.height += height;        return preferredSize;    }      protected static ImageIcon createAppletImageIcon(String path,                                              String description) {        int MAX_IMAGE_SIZE = 75000; //Change this to the size of                                    //your biggest image, in bytes.        int count = 0;        BufferedInputStream imgStream = new BufferedInputStream(           DiningPhilosophers.class.getResourceAsStream(path));        if (imgStream != null) {            byte buf[] = new byte[MAX_IMAGE_SIZE];            try {                count = imgStream.read(buf);            } catch (IOException ieo) {                System.err.println("Couldn't read stream from file: " + path);            }            try {                imgStream.close();            } catch (IOException ieo) {                 System.err.println("Can't close file " + path);            }            if (count <= 0) {                System.err.println("Empty file: " + path);                return null;            }            return new ImageIcon(Toolkit.getDefaultToolkit().createImage(buf),                                 description);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }}