This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Because x++ is post incrementing the variable 'x'. ie The current value in 'x' (100) is taken as the return value and then 'x' is incremented. But before the method returns the finally clause is executed which prints out the new current value of 'x' (101).