Introduction Of JAVA

INTRODUCTION OF CORE-JAVA

Core JAVA

• Ø It is a breed of coffee.
• Ø Java developers want to think about name “oak” instead of java but it is already a name of anything.
• Ø Java was developed by James Gosling at SUN MICROSYSTEM, Inc. in 1982.
• Ø On Jan. 27, 2010 Sun was acquired by Oracle Corporation for US $7.4 billion.
• Ø Thus, Java is a product of Oracle.
• Ø Its World’s Popular and Secure language.
• Ø It is High level language.
• Ø Its works on 3 billion devices.

Slogan of JAVA

• Ø     JAVA is everywhere.
• Ø     JAVA resides in mobiles, client machines, server machines, embedded devices, smart phones, cloud etc.
• Ø     It shares the same basic features of the language and libraries.

Principle of JAVA

• Ø Write once, Run everywhere.

What is Library?

• Ø     JAVA library is a collection of pre-defined classes.

Flavors of JAVA

• Ø JAVA Standard Edition (SE) (Core java)
• Ø JAVA Enterprise Edition (EE) (Advance java)
• Ø JAVA Micro Edition for Mobiles (ME)

…………………………….. Many more…………………………………….

Features

• Ø Simple
• Ø Object Oriented Programming Structure (OOPs)
• Ø Interpreted
• Ø Robust
• Ø Secure
• Ø Portable
• Ø Multi-Threaded
• Ø Garbage Collector
• Ø Distributed

Key Points

• Ø Java is a case-sensitive language like C and C++.
• Ø Java is nearly 100% Object Oriented Programming language.
• Ø In java, it is not possible to make a function which is not a member of any class (as we do in C++).

Scope

• Ø     Advance java (Enterprise application)
• Ø     Android (Mobile app)
• Ø     Gaming (Games app)
• Ø     Embedded System (IOT-Internet of Things)

DEFINITION

Ø It is an Open Source of Object Oriented Programming.

OPEN SOURCE

Ø Any language/apps/software having GPL (General Public License) is called open source.

Ø GPL was developed by U.S.

Ø For getting GPL you have to fill a form provided by some companies in free like – Apache Software Foundation & Co.

GPL(General Public License)

Ø It is free.

Ø Provides original source code & documentation.

Ø Can use for commercial.

Ø Can be used for personal or public purpose.

Ø Can be modified/update.

Remember:-

Ø It provides all services but never use its name.

OOPs

OBJECT: -

Ø Real World Entity(A thing that has existence in real world i.e., can see and touch)

ORIENTED: -

Ø Way of thinking.

PROGRAMMING: -

Ø A set of instructions which is used to solve for any particular task/problem.

LANGUAGE: -

Ø A medium to communicate.

First Program

public class HelloWorld

{

public static void main(String []args)

{

System.out.println(“Hello! How are you.”)

}

}