This week's book giveaways are in the iOS and Features new in Java 8 forums. We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line! See this thread and this one for details.
Static variable should be changed inside static syncronised methods in order to be thread-safe. Two threads that access a static syncronized method, will always block each other, regardless if they are using the same instance or two different instances.