DATA TYPES IN JAVA

DATA TYPES 

Data types are the domains which determine what type of contents can be stored in a variable.

In Java, there are two types of data types:

1. Primitive data types

2. Reference data types

 

1. Primitive Data Types:

Primitive data types are non-grouped pieces of data which can have only one value at a time. They are the simplest built in forms of data in Java. Other data types are made up of combination of primitive data types.

The primitive data type keywords are as shown: 

Primitive data types:  In java we have 8 primitive data types, they are as follows

Byte    : it is used to store an integer value up to 8 bits (-2^7 to 2^7-1).

Short  : it is used to store an integer value up to 16 bits (-2^15 to 2^15-1).

Int      : it is used to store an integer value up to 32 bits (-2^31 to 2^31-1).

Long   : it is used to store an integer value up to 64 bits (-2^63 to 2^63-1).

Float   : it is used to store a decimal value up to 32 bits.

double  : it is used to store a decimal value up to 64 bits.

Boolean: it is used for storing Boolean values like either TRUE or FALSE.

Char    : it is used for storing a single character.

Reference Data Types

Reference data types are made by the logical grouping of primitive data types. These are called reference data types because they contain the address of a value rather than the value itself. Arrays, objects, interfaces etc. are examples of reference data types.