Data Types (Java)

Code

Data Types:

There are two types:

               Primitive Data Types.

               Object / Reference data types.

Primitive Data Types:

Primitive data types are those which are defined by java, there are 8 data types, let’s have a look on them with some description and examples.

_­int:

    It is 32-bit signed and unsigned integer

     If you don’t assign some value at initialization of variable then its default value is 0

     For example int a; // now if you print it , it will show you ‘0’ on console

float:

   It is 32-bit and upto 754 decimal floating point number.

     For example float a = 1.2;

double:

   It is 64-bit and upto 754 decimal floating point number.

    For example double a = 1.256;

char:

   It is 16-bit Unicode characters.

    For example char temp = ‘A’;

boolean:

   It represents true or false.

    For example Boolean result = true;

_­

long:

   It is 64-bit signed integer

    For example long a = 500000;

short:

   It is 16-bit signed integer

    For example short a = 500;

_­byte:

   It is 8-bit signed integer

    For example byte a = 500;

Object / Reference Data Types:

Usually we create reference data types while creating object of class i.e.,

Student st1 = new Student(); // object is created and its reference also

If,

Student st1 = null; // it means object has a reference null