Data Types — Integer Data TypesJava's basic data types are almost identical to C/C++ data types. The main difference is that Java's types all have a set size regardless of platform, while C/C++'s data types only have a minimum number of bits, which causes some variation between platforms. It also has the same two categories; Integer and Floating Point.
|boolean||1||true or false||like C++'s bool, but it can't be assigned with a number|
|char||16||0 to 65535||This is bigger than C's char. This is because Java strings are Unicode, not ASCII. It's also unsigned by default.|
|byte||8||-128 to 127||Standard issue 'byte'|
|short||16||-32768 to 32767||just like a char, but signed by default|
|int||32||-2147483648 to 2147483647||standard-issue integer number type|
|long||64||-9223372036854775808 to 9223372036854775807||For very huge integers|
Floating Point types:
|float||32||+/- 1.4023x10-45 to 3.4028x10+38||general purpose real-number|
|double||64||+/- 4.9406x10-324 to 1.7977x10308||higher-precision real number|
All data types in Java are always signed (except for boolean, of course). Also note that long is guaranteed to be 64 bits long.