Introducing Java Object Creation and Data Types

Object Creation

In Java, an object is created from a class.Only a Class can be converted into an Object.

Oracle Corporation

Company Oracle = new Oracle();

Class Name - Company

Variable Name - oracle

Assignment              - =

Object Generate Keyword - new

Parameter List variable - ()

Line End                - ;

Data Types

Primitive Data Types

byte - integer

char - integer

short - integer

int - integer

long - integer

float - floating point

double - floating point

Integer

Float

Binary 1/0 True/False

Integer Hierarchy

1.Long

2.int

3.short

4.char

5.byte

Floating Hierarchy

1.double

2.float

int  a = 5;              integer
long b = 7;
a+b;
(Any Arithmatic Expression)

foat   c = 7.8;         float 
double d = 9;
d-c;

long  e = 123456;      various
float f = 789.76;      types
e+f;

Access is possible if the related
Primitive Types are of the same
type. If the types are different,
it cannot be accessed directly.