Just Java™ 2

long

The type long is a 64-bit, signed, two's-complement quantity. It should be used when calculations on whole numbers may exceed the range of int. Using longs, the range of values is –2⁶³ to (2⁶³–1). Numbers up in this range will be increasingly prevalent in computing, and 2⁶⁴ in particular is a number that really needs a name of its own. In 1993, I coined the term “Bubbabyte” to describe 2⁶⁴ bytes. Just as 2¹⁰ bytes is a Kilobyte, and 2²⁰ is a Megabyte, so 2⁶⁴ bytes is a Bubbabyte. Using a long, you can count up to half a Bubbabyte less one.

example declaration:

long nationalDebt;

range of values: –9,223,372,036,854,775,808 to 9,223,372,036,854,775,807

A word about casts (type conversion)

All variables have a type in Java, and the type ...