OnJava8-Examples/tasks/Joining.java

// tasks/Joining.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// Understanding join()

class Sleeper extends Thread {
  private int duration;
  public Sleeper(String name, int sleepTime) {
    super(name);
    duration = sleepTime;
    start();
  }
  @Override
  public void run() {
    try {
      sleep(duration);
    } catch(InterruptedException e) {
      System.out.println(getName() +
        " was interrupted. " +
        "isInterrupted(): " + isInterrupted());
      return;
    }
    System.out.println(getName() + " has awakened");
  }
}

class Joiner extends Thread {
  private Sleeper sleeper;
  public Joiner(String name, Sleeper sleeper) {
    super(name);
    this.sleeper = sleeper;
    start();
  }
  @Override
  public void run() {
   try {
      sleeper.join();
    } catch(InterruptedException e) {
      System.out.println("Interrupted");
    }
    System.out.println(getName() + " join completed");
  }
}

public class Joining {
  public static void main(String[] args) {
    Sleeper
      sleepy = new Sleeper("Sleepy", 1500),
      grumpy = new Sleeper("Grumpy", 1500);
    Joiner
      dopey = new Joiner("Dopey", sleepy),
      doc = new Joiner("Doc", grumpy);
    grumpy.interrupt();
  }
}
/* Output:
Grumpy was interrupted. isInterrupted(): false
Doc join completed
Sleepy has awakened
Dopey join completed
*/