/*
 * "hello world" program, version 1:
 *
 * creates threads using anonymous inner class implementing Runnable.
 *
 * command-line argument specifies number of threads.
 */
package csci3366.sample.hello;
import csci3366.sample.utility.Utility;

public class Hello1 {

    public static void main(String[] args) {

        /* get number of threads from command line */

        int numThreads = Utility.getIntegerArg(args, 0, 1, 
                "numThreads", "arguments:  numThreads");

        /* create threads */

        Thread[] threads = new Thread[numThreads];

        for (int i = 0; i < threads.length; ++i) {
            threads[i] = new Thread(new Runnable() {
                public void run() {
                    System.out.println("hello, world, from thread " + 
                        Thread.currentThread().getName());
                }
            });
        }

        /* start them up */

        System.out.println("starting threads");

        for (int i = 0; i < threads.length; ++i) {
            threads[i].start();
        }

        /* wait for them to finish */

        for (int i = 0; i < threads.length; ++i) {
            try {
                threads[i].join();
            }
            catch (InterruptedException e) {
                System.err.println("should not happen");
            }
        }

        System.out.println("threads all done");

    }
}