Use synchronized block to control access to List - Java Thread

Java examples for Thread:synchronized

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Description

Use synchronized block to control access to List

Demo Code



import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    int nextInitial = 1;
    private int initialCapacity = 10;
    private List<Integer> list = new ArrayList<>(initialCapacity);

    public static void main(String[] args) {
    Main threadSignaling = new Main();
    int mPublisher, nSubscriber;
    Scanner scanner = new Scanner(System.in);

    System.out.print("Enter Number of Publisher: ");
    mPublisher = scanner.nextInt();/* w  w  w  .  j a va 2s  .com*/

    System.out.print("Enter Number of Subscriber: ");
    nSubscriber = scanner.nextInt();

    for (int i = 0; i < mPublisher; i++) {
        Thread publisher1 = new Thread(() -> threadSignaling.publisher());
        publisher1.start();
    }

    for (int i = 0; i < nSubscriber; i++) {
        Thread subscriber1 = new Thread(() -> threadSignaling.subscriber());
        subscriber1.start();
    }

}

    public void subscriber() {

        synchronized (this) {
            try {
                while (list.isEmpty()) {
                    this.wait();
                }
                System.out.println(Thread.currentThread().getName() + " "
                        + nextInitial + ". Message subscribed..."
                        + list.get(list.size() - 1));
                list.remove(list.size() - 1);
                this.notifyAll();
            } catch (InterruptedException e) {
            }
        }
    }

    public void publisher() {

        synchronized (this) {
            try {
                while (!list.isEmpty()) {
                    this.wait();
                }
                list.add(nextInitial);
                System.out.println(Thread.currentThread().getName() + " "
                        + nextInitial + ". Message published..."
                        + list.get(list.size() - 1));
                nextInitial++;
                this.notifyAll();
            } catch (InterruptedException e) {
            }
        }
    }
}

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