Implementing Runnable

The second way to create a thread is to use a class that implements Runnable. Here is an example of such a class that has almost exactly the same functionality as class AThread: 

public class ARunnable implements Runnable {
  int i1, i2;

  public ARunnable(int i1, int i2) {
    this.i1 = i1;
    this.i2 = i2;
  }

  public void run() {
    for (int i = i1; i <= i2; i++) {
      System.out.println("child thread "  + i);
      try {
        TimeUnit.SECONDS.sleep(1);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
}

The only difference is that there is no isDaemon() method in the Runnable interface, so we cannot print whether the thread is daemon or not.