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.
The trick is - if you have a local variable shadowing a member variable, and you actually want to to something to the member variable, then you need to refer to it as "this.b" to distinquish it from local variable b.
"JavaRanch, where the deer and the Certified play" - David O'Meara