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Byte data type is an 8-bit signed two's complement integer.
Short data type is a 16-bit signed two's complement integer.
Int data type is a 32-bit signed two's complement integer.
Long data type is a 64-bit signed two's complement integer.
Float data type is a single-precision 32-bit IEEE 754 floating point.
double data type is a double-precision 64-bit IEEE 754 floating point.
boolean data type represents one bit of information.
char data type is a single 16-bit Unicode character.
Reference Data Types
are created using defined constructors of the classes. They are used to access objects
a source code representation of a fixed value. They are represented directly in the code without any computation.