java primitive 数据类型长度

Java determines the size of each primitive type. These sizes don’t change from one machine architecture to another as they do in most languages. This size invariance is one reason Java programs are portable.

Primitive type	Size	Minimum	Maximum	Wrapper type
boolean	—	—	—	Boolean
char	16-bit	Unicode 0	Unicode 216- 1	Character
byte	8-bit	-128	+127	Byte
short	16-bit	-215	+215—1	Short
int	32-bit	-231	+231—1	Integer
long	64-bit	-263	+263—1	Long
float	32-bit	IEEE754	IEEE754	Float
double	64-bit	IEEE754	IEEE754	Double
void	—	—	—	Void

All numeric types are signed, so don’t look for unsigned types.

所有的primitive数据类型都是有符号的，那么怎么表示无符号的4字节数呢？