What is the security of the data types exhibited in the below Java program? Java source code: package application; public class JavaConcurrency {     private static final Object lock = new Object();     private static boolean isCountingUpDone = false;          public static void main(String[] args) {         Runnable countUp = () -> {             for(int i = 0; i <= 20; i++) {                 synchronized (lock) {                     System.out.println("Thread 1: " + i);                     if (i == 20) {                         isCountingUpDone = true;                         lock.notifyAll(); // Notify thread 2 to start counting down                         System.out.println("\nThread 1 complete\n");                     }                 }                 try {                     Thread.sleep(400); // Slow down thread                 }                  catch (InterruptedException e) {                     Thread.currentThread().interrupt();                 }             }         };                  Runnable countDown = () -> {             synchronized (lock) {                 while (!isCountingUpDone) {                     try {                         lock.wait(); // Wait for thread 1 to finish                     }                     catch (InterruptedException e) {                         Thread.currentThread().interrupt();                     }                 }             }                          for (int i = 20; i >= 0; i--) {                 System.out.println("thread 2: " + i);                 try {                     Thread.sleep(400); // Slow down thread                 }                 catch (InterruptedException e) {                     Thread.currentThread().interrupt();                 }             }             System.out.println("\nThread 2 complete");         };              new Thread(countUp).start();         new Thread(countDown).start();     } }

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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What is the security of the data types exhibited in the below Java program?

Java source code:

package application;

public class JavaConcurrency {

    private static final Object lock = new Object();
    private static boolean isCountingUpDone = false;
    
    public static void main(String[] args) {
        Runnable countUp = () -> {
            for(int i = 0; i <= 20; i++) {
                synchronized (lock) {
                    System.out.println("Thread 1: " + i);
                    if (i == 20) {
                        isCountingUpDone = true;
                        lock.notifyAll(); // Notify thread 2 to start counting down
                        System.out.println("\nThread 1 complete\n");
                    }
                }
                try {
                    Thread.sleep(400); // Slow down thread
                } 
                catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
            }
        };
        
        Runnable countDown = () -> {
            synchronized (lock) {
                while (!isCountingUpDone) {
                    try {
                        lock.wait(); // Wait for thread 1 to finish
                    }
                    catch (InterruptedException e) {
                        Thread.currentThread().interrupt();
                    }
                }
            }
            
            for (int i = 20; i >= 0; i--) {
                System.out.println("thread 2: " + i);
                try {
                    Thread.sleep(400); // Slow down thread
                }
                catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
            }
            System.out.println("\nThread 2 complete");
        };
    
        new Thread(countUp).start();
        new Thread(countDown).start();
    }
}

 

 

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