ex1

package exercise;

class Message implements Runnable {

    private static int taskCount = 1;
    private final int id = taskCount++;

    public Message() {
        System.out.println("create " + id);
    }

    @Override
    public void run() {
        for (int i = 0; i < 3; i++) {
            System.out.println("run " + id);
            Thread.yield();
        }
        System.out.println("end " + id);
    }
}

public class Ex01 {

    public static void main(String[] args) {

        for (int i = 0; i < 5; i++) {
            Thread t = new Thread(new Message());
            t.start();
        }
    }
}