Run Threads in Java

 package test2;

/**
 *  The output is something like 0 3 4 1 2 5 6 7 8 9
 *  Note all threads are associated with one object.
 */
public class ThreadTest implements Runnable {
    int counter;

    public static void main(String args[]) {
        Runnable run = new ThreadTest();
        for (int i = 0; i < 10; i++) {
            Thread thread = new Thread(run);
            thread.setDaemon(true); // so program can exit
            thread.start();
        }
    }

    public void run() {
        System.out.println(counter++);
        for (int j = 0; j < 100000000; j++) {
            String x = "" + Math.sqrt(1.2111);
        }
        System.out.println( " counter=" + counter++);
    }
}