public class tester 
{
	public static void main(String[] args) throws Exception
	{
		test1 t = new test1();
		t.start();
		System.out.println("bbb");
		t.notify();
	}
}


class test1 extends Thread
{
	public void run()
	{
		try{
				while( true )
				{
					synchronized (this) {
					System.out.println("a");
					wait(1000);
					}
				}
		} catch (InterruptedException e) { System.out.println("c"); return; }
	}
}


////////// OUTPUT: //////////////
Exception in thread "main" java.lang.IllegalMonitorStateException
bbb
a
	at java.lang.Object.notify(Native Method)
	at tester.main(tester.java:9)
a
a
a
a
a
a
(Kept outputting 'a's until I manually interrupted it [from the keyboard, that is].)