PA1 Java

gistfile1.txt

import java.util.concurrent.Semaphore;

public class PingPong {


    private Semaphore ping_semaphore = new Semaphore(1, true), pong_semaphore = new Semaphore(1, true);
    private int maxcount = 100;

    class Ping implements Runnable {
        @Override
        public void run() {

            for (int i = 0; i < maxcount; i++) {

                try {
                    ping_semaphore.acquire();
                } catch (InterruptedException e) {
                    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
                }

                System.out.println("Ping!");
                pong_semaphore.release();
            }
        }
    }

    class Pong implements Runnable {
        @Override
        public void run() {
            for (int i = 0; i < maxcount; i++) {

                try {
                    pong_semaphore.acquire();
                } catch (InterruptedException e) {
                    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
                }

                System.out.println("Pong!");
                ping_semaphore.release();
            }
        }
    }

    public void mainCycle() {
        try {
            pong_semaphore.acquire();
        } catch (InterruptedException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }

        Thread ping = new Thread(new Ping());
        ping.start();
        Thread pong = new Thread(new Pong());
        pong.start();
        try {
            ping.join(100000);
            pong.join(100000);
        } catch (InterruptedException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }

    }


    public static void main(String[] args) {
        System.out.println("Ready... Set... Go!");
        PingPong t = new PingPong();
        t.mainCycle();
        System.out.println("Done");
    }
}