Java thread wait notify usage What is the output of Narendra Flash

Author: Narendra

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Question 240 / 297: What is the output of running the following program?

class Tester extends Thread {
	int total;

	public static void main(String[] args) throws Exception {
		Tester t = new Tester();
		t.start();
		System.out.println("hi how are you:");
		synchronized (t) {
			System.out.println("waiting for t to complete");
			t.wait();
			System.out.println("total" + t.total);
		}
	}

	synchronized public void run() {
		for (int i = 0; i < 3; i++) {
			total = total + i;
		}
	}
}

A main thread will wait indefinitely.

B total 0 is part of the output.

C total 3 is part of the output .

D it depends upon which thread has got the cpu first .

<< First < Previous Next > Last >>

Explanation:

It depends on the cpu which thread will be executed first.

also whenever a thread completes it call to notifyAll() so that all the waiting thread can get into.

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