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When you declare a variable, you explicitly set the variable's name and data type. The Java programming language has two categories of data types: primitive and reference. This table shows all of the primitive data types:
Keyword Description Size/Format (integers) byte
Byte-length integer 8-bit two's complement short
Short integer 16-bit two's complement int
Integer 32-bit two's complement long
Long integer 64-bit two's complement (real numbers) float
Single-precision floating point 32-bit IEEE 754 double
Double-precision floating point 64-bit IEEE 754 (other types) char
A single character 16-bit Unicode character boolean
A boolean value ( true
orfalse
)true or false Reference types are arrays, or names of classes or interfaces.
The variable declaration also implicitly sets the variable's scope, and you may optionally provide an initial value for the variable within its declaration. The value of a final variable may not change after it's initialized.
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