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Java Introduction

Java is a truly object-oriented programming language developed by Sun Microsystems.
Goal was:"Write once, run anywhere, any time, forever"
The language is modeled on C++.

History

Features of Java

Object Oriented Concepts

Example :
Class Rose

Objects and Class



Example

class Person
{
float height;
int age;
String lastName;
void run(){...}
void eat(){...}
void sleep(){...}
}

Object-Oriented Principles



Java Working

How Java works?

Adding main() Method

This is the point where the execution of the program begins.
Object Creation Using 'new'
class Person{
...
public static void main(String args[]){
Person rama;
rama = new Person();
// Person rama = new Person();
rama.run();
rama.sleep();
}
}

First Program


class Hello
{
   public static void main(String args[])
   {
     System.out.println("Hello My Dear Students");
   }
}

Working with the program

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