Chapter 3: Data Types - Java Language Tutorial

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Primitive types

Java has two types of data types: Primitive Types and Reference Types.
Primitive types are passed to and from methods 'by value' which means that each time a primitive type is passed as argument, a new value is created on the stack.
Reference types are instances of classes (objects) and are handled later in this tutorial.

Java has eight primitive types:

boolean - has a value of 'true' or 'false' and 'false' is the default value.
char      - a 16 bit unicode character.
byte      - a signed integer of 8 bits. Values range from -128 to 127.
short     - a signed integer of 16 bits. Values range from -32768 to 32767
int       - a signed integer of 32 bits. Values range from -2147483648 to 2147483647.
long      - a signed integer of 64 bits. Values range from -9223372036854775808 to 9223372036854775807.
float     - a floating point number of 32 bits. Values range from 1.4E-45 to 3.4028235E+38.
double    - a floating point number of 64 bits. Values range from 4.9E-324 to 1.7976931348623157E+308.

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