A detailed introduction to the eight primitive data types in Java

Types of	number of digits	range
boolean	java virtual machine decision	true or false
char	16bits (2 bytes)	0~65535
byte	8bits (1 byte)	-128~127
short	16bits (2 bytes)	-32768~32767
int	32bits (4 bytes)	-2147482648~2147483647
long	64bits (8 bytes)	- very big~+ very big (the landlord can't remember)
float	32bits (4 bytes)	Variable scale
double	64bits (8 bytes)	Variable scale

Note: byte, short, int, and long are numeric values ​​(with positive and negative signs). float and double are floating point types!