Java Thread notify() method

The notify() method of thread class is used to wake up a single thread. This method gives the notification for only one thread which is waiting for a particular object.

If we use notify() method and multiple threads are waiting for the notification then only one thread get the notification and the remaining thread have to wait for further notification.

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 notify() method
            this.notify1.notify();
            System.out.println(Thread.currentThread().getName() + "...notified");
        }
    }
}
public class JavaNotifyExp 
{
    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();
    }
}

Output:

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

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