java 数据类型

Literals

8bit　 1byte byte

16bit 2byte　short

32bit　4byte　int

64bit　8byte　long

http://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.2.1
The values of the integral types are integers in the following ranges:

For

byte

, from -128 to 127, inclusive

For

short

, from -32768 to 32767, inclusive

For

int

, from -2147483648 to 2147483647, inclusive

For

long

, from -9223372036854775808 to 9223372036854775807, inclusive

For

char

, from

'\u0000'

to

'\uffff'

inclusive, that is, from 0 to 65535

0x0000 - 0xffff 0-65535

0x0000 - 0xFFFF 0-65535