JAVA- What is class?

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

1. Primitive datatype

2. 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);
}
}