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.
System.gc() or Runtime.gc() simply make a tentative call to run the garbage collector. They do not force at all the garbage collector to be run. Thus the garbage collector may or may not run, but you can never be sure Regards Jonathan