Java’s Primitive Data Types
boolean:
1-bit. May take on the values true and false only.
byte:
1 signed byte (two’s complement). Covers values from -128 to 127.
short:
2 bytes, signed (two’s complement), -32,768 to 32,767
int:
4 bytes, signed (two’s complement). -2,147,483,648 to 2,147,483,647.
long:
8 bytes signed (two’s complement). Ranges from -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807.
float:
4 bytes, IEEE 754. Covers a range from 1.40129846432481707e-45 to 3.40282346638528860e+38 (positive or negative).
double:
8 bytes IEEE 754. Covers a range from 4.94065645841246544e-324d to 1.79769313486231570e+308d (positive or negative).
char:
2 bytes, unsigned, Unicode, 0 to 65,535