Third group session for advanced programming.

Counter.java

public class Counter extends Thread {

    private String name;
    private int count;
    private int delay;

    public Counter(String name, int delay) {
        this.name = name;
        this.delay = delay;
        this.count = 0;
    }
    
    public void run() {
        while (true) {
            try {
                Thread.sleep(delay);
            } catch (InterruptedException e) {}

            count++;
            System.out.println(name + ": " + count);
        }
    }

    public static void main(String[] args) {
        int numCounters = 0;
        for (String arg : args) {
            // create counter
            // Counter c = new Counter("Counter"+(numCounters++),Integer.parseInt(arg));
            // c.start();
            // kuerzer
            new Counter("Counter"+(numCounters++),Integer.parseInt(arg)).start();
        }
    }
}

CounterGUI.java

import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;

public class CounterGUI extends WindowAdapter implements Runnable {

    private Integer counter = 0;
    private long delay;
    private boolean running;

    private JFrame frame;
    private JLabel label;

    public CounterGUI(String name, long delay) {
        this.delay = delay;
        this.running = true;

        frame = new JFrame(name);
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.addWindowListener(this);

        label = new JLabel("0000", SwingConstants.CENTER);
        label.setFont(new Font(null, Font.BOLD, 100));

        frame.getContentPane().add(label);
        frame.pack();
        frame.setVisible(true);
    }
    

    public void windowClosed(WindowEvent e) {
        running = false;
    }

    public void run() {
        while (true) {
            try {
                Thread.sleep(delay);
            } catch (InterruptedException e) {}
            counter++;
            label.setText(counter.toString());
        }
    }

    public static void main(String[] args) {
        int numCounters = 0;
        for (String arg : args) {
            CounterGUI c = new CounterGUI("Counter"+(numCounters++),Integer.parseInt(arg));
            Thread t = new Thread(c);
            t.start();
        }
    }
}

PingPong.java

public class PingPong {

    private boolean pingsTurn; // true = ping, false = pong is allow to play
    private String output;

    public PingPong() {
        this.pingsTurn = true;
    }

    public synchronized void ping() {
        while(!pingsTurn) {
            try {
                wait();
            } catch (InterruptedException e) {}
        }
        output = new String("ping");
        System.out.println(output);
        pingsTurn = false;
        notify();
    }
    public synchronized void pong() {
        while (pingsTurn) {
            try {
                wait();
            } catch (InterruptedException e) {}
        }
        output = new String("pong");
        System.out.println(output);
        pingsTurn = true;
        notify();
    }


    public static void main (String[] args) {

        PingPong game = new PingPong();
        Ping p1 = new Ping(game);
        Pong p2 = new Pong(game);
        p1.start();
        p2.start();
    }

    private static class Ping extends Thread {
        
        private PingPong game;

        public Ping(PingPong game) {
            this.game = game;
        }

        public void run() {
            while (true) {
                game.ping();
            }
        }
    }

    private static class Pong extends Thread {
        
        private PingPong game;

        public Pong(PingPong game) {
            this.game = game;
        }

        public void run() {
            while (true) {
                game.pong();
            }
        }
    }
}