OOPS:
OOPS - Object Oriented Programming Language
Java is a object oriented programming language
Java is simple and easy to understand
OOPS Concept:
Class
Object
Inheritance
Polymorphism
Abstraction
Encapsulation
Class:
Class is a blue print /template
Class is a container
Class is a collection of objects and methods
Class Home{
--------
--------
}
Class name should start with upper case
class Home{
public static void main (String[] args){
System.out.println("HELLO WORLD!!!!");
}
}
In the above program the classes are
Home
String
System
These three are the class in the above program because it start with uppercase
DATA TYPES IN JAVA:
- In java Datatypes are divide into two
Primitive datatype
Non-Primitive datatype
Primitive datatype
byte->1byte=8bit
short->2byte
int->4byte
long->8byte
float->4byte
double->8byte
char->It store only one character
boolean->1 bit [true/false]
Non Primitive datatype:
String
class
array
class Home{
Static string name ="Shobi";
Static int addno=108;
//static keyword is used to store the class information is common for all and it take 1 memory space for whole class
public static void main(String[] args){
System.out.println(Home.name);
System.out.println(Home.age);
}
}
