This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I have SortedMap and need to remove a given number of elements from there in random order (i.e. it doesn't matter which elements will be removed, but they should be random)
Do you have any idea of how to do that in effective way?