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interthreadcommunication2.java

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class ThreadB extends Thread //this thread performing updation so called notify method

{

int tot=0;

public void run()

{

synchronized(this)

{

/*1*/System.out.println("child thread start calculation");

for (int i = 1; i <= 100; i++) {

tot += i;

}

/*2*/System.out.println("Child thread trying to give notification");

/*3*/this.notify();//notify method

}

}

}

//Run this code and see o/p and also analyse

//most of time main thread get chance according to that flow indicated by numbers

/*

As main thread get chance but main sleep for 10 sec then child start

calculation after child send notification after that main thread is waiting

so we get o/p as

child thread start calculation

Child thread trying to give

notification main thread trying to call wait method

AND program is stucked here only

*/

class interthreadcommunication2 //this thred expecting updation so called wait method

{

public static void main(String[] args) throws InterruptedException

{

ThreadB b=new ThreadB();

b.start();

Thread.sleep(10000);

System.out.println("main thread come out of sleep");

synchronized(b)

{

/*4*/System.out.println("main thread trying to call wait method");

b.wait();//after calling this main thread go into waiting state

/*5(not execute)*/System.out.println("main thread got notificaion ");//as thread not get any notification

/*6(not execute)*/System.out.println(b.tot);

}

}

}