This week's book giveaway is in the Raspberry Pi forum. We're giving away four copies of Getting started with Java on the Raspberry Pi and have Frank DelPorte on-line! See this thread for details.
in table 3.12 1st row - key has null value and mapping function returns null - merge function will associate new value with that key (mapping function isn't even called), won't remove it. Right?
Thanks for reporting this. You are correct. Have a cow for reporting something detailed that was an incorrect fact and not just a typo! (We still like to hear about typos, but incorrect facts are more important!) I've added this to the errata