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Scala program to demonstrate the join() method of Thread class

belongs to collection: Scala Threading Programs

YasminRadwan26
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2022-07-09
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Here, we will demonstrate the join() method of the Thread class. The join() method waits for a thread to die.

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YasminRadwan26
2022-07-09
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Program/Source Code:

The source code to demonstrate the join() method of the Thread class is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to demonstrate the
// thread.join() method

class MyThread extends Runnable {
  override def run() {
    var cnt: Int = 0;

    while (cnt < 5) {
      printf("Counter: %d\n", cnt);
      Thread.sleep(500);
      cnt = cnt + 1;
    }
  }
}

object Sample {
  // Main method
  def main(args: Array[String]) {
    var ex = new MyThread();
    var thrd1 = new Thread(ex);
    var thrd2 = new Thread(ex);
    var thrd3 = new Thread(ex);

    thrd1.start();
    thrd1.join();
    thrd2.start();
    thrd3.start();
  }
}

Output:

Counter: 0
Counter: 1
Counter: 2
Counter: 3
Counter: 4
Counter: 0
Counter: 0
Counter: 1
Counter: 1
Counter: 2
Counter: 2
Counter: 3
Counter: 3
Counter: 4
Counter: 4

Explanation:

Here, we created a class MyThread by implementing the Runnable interface and the implement run() method.

We created a class MyThread by implementing the Runnable interface and implement the run() method. In this method, we used the Thread.sleep() method to sleep a thread for a specific time.

In the main() function, we created three threads. And, we called the start() method to start the execution of the thread and also called the join() method. The join() method waits for a thread to die.

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