Java Thread notifyAll() method

The notifyAll() method of thread class is used to wake up all threads. This method gives the notification to all waiting threads of a particular object.

If we use notifyAll() method and multiple threads are waiting for the notification then all the threads got the notification but execution of threads will be performed one by one because thread requires a lock and only one lock is available for one object.

Syntax

Return

This method does not return any value.

Exception

IllegalMonitorStateException: This exception throws if the current thread is not the owner of the object's monitor.

Example

class Notify1 extends Thread 
{
    public void run()
    {
        synchronized(this)
        {
            System.out.println("Starting of " + Thread.currentThread().getName());
            try {
                this.wait();
            }
            catch (InterruptedException e) {
                e.printStackTrace();}
            System.out.println(Thread.currentThread().getName() + "...notified");
        }
    }
}
class Notify2 extends Thread {
    Notify1 notify1;
    Notify2(Notify1 notify1)
    {
        this.notify1 = notify1;
    }
    public void run()
    {
        synchronized(this.notify1)
        {
            System.out.println("Starting of " + Thread.currentThread().getName());
            try {
                this.notify1.wait();
            }
            catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + "...notified");
        }
    }
} 
class Notify3 extends Thread 
{
    Notify1 notify1;
    Notify3(Notify1 notify1)
    {
        this.notify1 = notify1;
    }
    public void run()
    {
        synchronized(this.notify1)
        {
            System.out.println("Starting of " + Thread.currentThread().getName());
            // call the notifyAll() method
            this.notify1.notifyAll();
            System.out.println(Thread.currentThread().getName() + "...notified");
        }
    }
}
public class JavaNotifyAllExp 
{
    public static void main(String[] args) throws InterruptedException
    {
        Notify1 notify1 = new Notify1();
        Notify2 notify2 = new Notify2(notify1);
        Notify3 notify3 = new Notify3(notify1);
        
        // creating the threads 
        Thread t1 = new Thread(notify1, "Thread-1");
        Thread t2 = new Thread(notify2, "Thread-2");
        Thread t3 = new Thread(notify3, "Thread-3");
        
        // call run() method
        t1.start();
        t2.start();
        Thread.sleep(100);
        t3.start();
    }
}

Test it Now

Output:

Starting of Thread-1
Starting of Thread-2
Starting of Thread-3
Thread-3...notified
Thread-2...notified
Thread-1...notified

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