Basic JAVA 2

Basic JAVA 2

Data Types in Java

Java language has a rich implementation of data types. Data types specify size and the type of values that can be stored in an identifier

In java, data types are classified into two catagories:

1) Primitive Data type

2) Non-Primitive Data type

1) Primitive Data type :

A primitive data type can be of eight types :

char  boolean  byte  short  int  long  float  double


A primitive data type can be of eight types :

Once a primitive data type has been declared its type can never change, although in most cases its value can change. These eight primitive type can be put into four groups:

Data Type	Default Value	Default size
boolean	false	1 bit
char	'\u0000'	2 byte
byte	0	1 byte
short	0	2 byte
int	0	4 byte
long	0L	8 byte
float	0.0f	4 byte
double	0.0d	8 byte

2) Primitive Data type :

A reference data type is used to refer to an object. A reference variable is declare to be of specific and that type can never be change. We will talk a lot more about reference data type later in Classes and Object lesson.For example, Employee, Puppy etc:

Class objects, and various type of array variables come under reference data type. Default value of any reference variable is null.

Example: Animal animal = new Animal("tiger");