[Java 基本變數形態]

boolean

1 bit.
true / false

byte

1 byte
-128 ~ 127

short

2 bytes
-32,768 ~ 32,767

int

4 bytes
-2,147,483,648 ~ 2,147,483,647

long

8 bytes
-9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807.

float

4 bytes
1.40129846432481707e-45 ~ 3.40282346638528860e+38（正或負）

double

8 bytes
4.94065645841246544e-324 ~1.79769313486231570e+308（正或負）

char

2 bytes
0 ~ 65,535