Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.concurrent.CountDownLatch;

public class Main {
    CountDownLatch latch = new CountDownLatch(1);

    public void a() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("A: I am going to sleep");
                System.out.println("A: I slept one full day. Feels great.");
                System.out.println("A: Hey B, wake up!");
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                latch.countDown();
            }
        }).start();
    }

    public void b() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("B: I am  going to sleep. A, please wake me up.");
                try {
                    latch.await();
                } catch (InterruptedException e) {
                }
                System.out.println("B: Thank you A for waking me up!");
            }
        }).start();
    }

    public static void main(String[] args) {
        Main obj = new Main();
        obj.a();
        obj.b();
    }

}