java Features

EXAMPLE PROGRAM:

public class Home{
public static void ( String args[]){
    System.out.println("hello");
}
}

OUTPUT:
hello

Java Features:

OBJECT ORIENTED PROGRAMMING LANGUAGE:

• OOPS in Java refers to Object-Oriented Programming System, which is built on four main principles:

1. Encapsulation,
2. Inheritance,
3. Polymorphism,
4. Abstraction.

• These concepts help Java create modular, reusable, and maintainable applications.
• OOPS (Object-Oriented Programming System) is a programming paradigm centered around objects that contain data (fields) and behavior (methods).
• Java is inherently object‑oriented and uses OOPS to structure programs efficiently.

OOPS Concepts in Java

1. Class

• A class is a blueprint for creating objects. It defines attributes and methods. Example: Car is a class; BMW is an object.

2. Object

• An object is an instance of a class.
  It has:

• State (data)

• Behavior (methods)

• Identity (unique memory reference)

3. Encapsulation

• Binding data and methods together while restricting direct access using access modifiers.
• Achieved using private fields and getter/setter methods.

4. Inheritance

• Allows one class to acquire properties and behaviors of another class.

• Promotes code reusability.

5. Polymorphism

• Ability of a method or object to take many forms.
• Compile-time polymorphism: Method overloading
• Runtime polymorphism: Method overriding

6. Abstraction

• Hiding internal implementation details and showing only essential features.
• Achieved using abstract classes and interfaces.

CLASS:

• Class is a container. (Blueprint, template.) Syntax:

Class Home{
   .......
   .......
}

• Class name must be meaningful.
• Class name should start with uppaercase.

class Home{
public static void main (String[] args){
System.out.println("HELLO WORLD!!!!");
}
}

• {Home, System, string} are class in func.

• No space between Class name.
  Eg: play ground

• can use {$, _}

• No special char allowed (except:$,_)

• Number are allowed at mid or end of Class.

• Not at the beginning of the classname.
  

class Home{
Static string name ="payilagam";
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);
}
}