This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I thought the output would be 50. Though the demothread calls notify it doesn't leave the synchronized context till i=50, so the main thread cannot print the sum, as it occurs in the synchronized context.