Introduction to Java

Core Java

Need of Object Oriented Programming:-

Disadvantages of POP :- 

● Data is exposed to whole program, so no security for data. 

● Difficult to relate with real world objects. 

● Importance is given to functions rather than the data. 

Introduction to OOP:-

● Object + Oriented + Programming 

● Deals with object to build program & software 

● Object = Identity + attributes (data) + behaviour (functions)

Principles of OOP:-

● Class 

● Object 

● Data Abstraction 

● Data Encapsulation 

● Polymorphism 

● Inheritance

Principles of OOP Language:-

● Classes: collection of similar objects 

● Objects: instance of class 

● Abstraction: hiding the implementation details and showing only functionality to the user. 

● Inheritance: adopt the characteristics of one class into another class 

● Encapsulation: wrapping of data in single unit 

● Polymorphism:perform a single action by different ways

What is JAVA ???

“Java is a programming language and a platform” 

“Write once, Run anywhere” 

● Java is a high level, robust, secured and object-oriented programming language. 

● Platform: Any hardware or software environment in which a program runs, is known as a platform. ● Since Java has its own runtime environment (JRE) and API, it is called platform.

Where it is used ???

● Desktop Applications such as acrobat reader, media player, antivirus etc. 

● Web Applications such as irctc.co.in, javatpoint.com etc. 

● Enterprise Applications such as banking applications. 

● Mobile 

● Embedded System 

● Smart Card 

● Robotics 

● Games etc.

History of Java

● The history of java starts from Green Team. 

● Green Team initiated a revolutionary task to develop a language for digital devices such as set-top boxes, televisions etc. 

● It was suited for internet programming. 

● Later, Java technology as incorporated by Netscape. 

● James Gosling - founder of java 

● Currently, Java is used in internet programming, mobile devices, games, e-business solutions etc. 

● James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. The small team of sun engineers called Green Team. 

● Originally designed for small, embedded systems in electronic appliances like set-top boxes. 

● Firstly, it was called "Greentalk" by James Gosling and file extension was .gt. 

● After that, it was called Oak and was developed as a part of the Green project.

History of Java

Why sun choosed "Oak" name? 

● Why Oak? Oak is a symbol of strength and choosen as a national tree of many countries like U.S.A., France, Germany, Romania etc. 

● In 1995, Oak was renamed as "Java" because it was already a trademark by Oak Technologies.

Why sun choosed "Java" name? 

● The team gathered to choose a new name. 

● The suggested words were "dynamic", "revolutionary", "Silk", "jolt", "DNA" etc. They wanted something that reflected the essence of the technology: revolutionary, dynamic, lively, cool, unique, and easy to spell and fun to say. 

● According to James Gosling "Java was one of the top choices along with Silk". 

● Since java was so unique, most of the team members preferred java. 

● Java is an island of Indonesia where first coffee was produced (called java coffee). 

● JDK 1.0 released in(January 23, 1996).

Java Features:-

● Simple 

● Secure 

● Portable 

● Object-Oriented 

● Robust 

● Multithreaded 

● Architecture-neutral 

● Interpreted 

● High performance 

● Distributed 

● Dynamic

Java Version:-

● JDK Alpha and Beta (1995) 

● JDK 1.0 (23rd Jan, 1996) 

● JDK 1.1 (19th Feb, 1997) 

● J2SE 1.2 (8th Dec, 1998) 

● J2SE 1.3 (8th May, 2000) 

● J2SE 1.4 (6th Feb, 2002) 

● J2SE 5.0 (30th Sep, 2004) 

● Java SE 6 (11th Dec, 2006) 

● Java SE 7 (28th July, 2011) 

● Java SE 8 (18th March, 2014) 

● Java SE 9 (21st September, 2017)

To Next Artical We Discuss About What is The feature of Java and what is difference between jdk,jre,jvm In Java With Details And example...

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