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.
Note, since the compiler does the implicit conversion without warning, you need to pay attention when using the compound-assignment operator. Some of the conversions are Narrowing conversions, just like in the last example, from an int to a byte. Narrowing conversions may lose information about the overall magnitude of a numeric value and may also lose precision.