Java Evolution

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By the end of 1980s and the early 1990s, Object-oriented programming using C++ took hold. For a brief moment, it seemed as if programmers had found the perfect language finally. C++ was a language that could be used to create a wide range of programs. However, forces were brewing that would drive computer language evolution forward once again. Within few years WWW (World Wide Web) and the Internet would reach critical mass. This event would cause another revolution in programming.

Java is general purpose language which is used for developing either Stand alone Programs or either you can develop We Programs or Web Applets First of all program of java is Compiled then it is transferred into the byte codes For Executing java programs java name of the compiler is used for Converting the java program into the byte code and then by using the interpreter we converts the Bytes code into the machine language.

If we Simply Execute the programs on our Machine then it is called as the Stand Alone Programs but if we using the Applets for Which includes Graphical Environment then it is called as Web Applets.

Contents

• JAVA History
• Features of Java
• How Java Differs from C and C++?
• Java and Internet
• Java and World Wide Web
• Java Environment

JAVA History

Every Languages have a history or Every Language has a past Java is Developed in 1991 in USA And it was Called as OAK and it is Developed by James Gosling name of the Engineer of the Microsoft Sun Team. Java Was Developed For Developing the Electronics' things Like VCR , Televisions etc. The History of Java Includes .

In 1990 Sun Microsoft Team develop java for Electronics Things but in 1991 java was Comes with the new name Called as OAK then After that in 1992 java was come with the new idea of developing Software's for the Handheld Devices Like Mobile Phones ,Pagers etc.

But in 1993 Java Was So Popular in the World Wide Web or in the Internet For Developing Games and Graphical Applications with the help of Applets The Most Important usable thing in Graphical Programming.

Features of Java

• Compiled and Interpreter
  

  Java has both Compiled and Interpreter Feature Program of java is First Compiled and Then it is must to Interpret it .First of all The Program of java is Compiled then after Compilation it creates Bytes Codes rather than Machine Language Then After Bytes Codes are Converted into the Machine Language is Converted into the Machine Language with the help of the Interpreter So For Executing the java Program First of all it is necessary to Compile it then it must be Interpret.

• Platform Independent
  

  Java Language is Platform Independent means program of java is Easily transferable because after Compilation of java program bytes code will be created then we have to just transfer the Code of Byte Code to another Computer This is not necessary for computers having same Operating System in which the code of the java is Created and Executed After Compilation of the Java Program We easily Convert the Program of the java top the another Computer for Execution.

• Object-Oriented
  

  We Know that is purely OOP Language that is all the Code of the java Language is Written into the classes and Objects So For This feature java is Most Popular Language because it also Supports Code Reusability, Maintainability etc.

• Robust and Secure
  

  The Code of java is Robust and Secure Means ot first checks the reliability of the code before Execution When We trying to Convert the Higher data type into the Lower Then it Checks the Demotion of the Code the It Will Warns a User to Not to do this So it is called as Robust.

• Secure
  

  When We convert the Code from One Machine to Another the First Check the Code either it is Effected by the Virus or not or it Checks the Safety of the Code if code contains the Virus then it will never Executed that code on to the Machine.

• Distributed
  

  Java is Distributed Language Means because the program of java is compiled onto one machine can be easily transferred to another machine and Executes them on another machine because facility of Bytes Codes So java is Specially designed For Internet Users which uses the Remote Computers For Executing their Programs on local machine after transferring the Programs from Remote Computers or either from the internet.

• Simple Small and Familiar
  

  Java is a simple Language Because it contains many features of other Languages like c and C++ and Java Removes Complexity because it doesn't use pointers, Storage Classes and Go to Statements and java Doesn't support Multiple Inheritance.

• Multithreaded and Interactive
  

  Java uses Multithreaded Techniques For Execution Means Like in other in Structure Languages Code is Divided into the Small Parts Like These Code of java is divided into the Smaller parts those are Executed by java in Sequence and Timing Manner this is Called as Multithreaded In this Program of java is divided into the Small parts those are Executed by Compiler of java itself Java is Called as Interactive because Code of java Supports Also CUI and Also GUI Programs.

• Dynamic and Extensible Code
  

  Java has Dynamic and Extensible Code Means With the Help of OOPS java Provides Inheritance and With the Help of Inheritance we Reuse the Code that is Pre-defined and Also uses all the built in Functions of java and Classes.

How Java Differs from C and C++?

1. C Uses header Files but java uses Packages.
2. C Uses Pointers but java doesn't supports pointers.
3. Java doesn't supports storage classes like auto, external etc.
4. The Code of C Language is Converted into the Machine code after Compilation But in Java Code First Converted into the Bytes Codes then after it is converted into the Machine Code.
5. C++ supports Operator Overloading but java doesn't Supports Operator Overloading.
6. In C++ Multiple Inheritance is Possible but in java A Class Can not Inherit the features from the two classes in other words java doesn't supports Multiple Inheritance The Concept of Multiple Inheritances is Introduced in the Form of Interfaces.
7. Java Uses import statement for including the contents of screen instead of #include.
8. Java Doesn't uses goto.
9. Java Doesn't have Destructor like C++ Instead Java Has finalize Method.
10. Java Doesn't have Structure Union , enum data types.

Java and Internet

Java is also most popular language on web because java provides us the facility of Applets those are used for Creating Graphical Applications From Internet a user can download any application and Execute in the Applet.

Java and World Wide Web

About the time that the details of Java were being worked out, a second, and ultimately, more important, factor was emerging that would play a crucial role in the future of Java. This second force was, of course, the World Wide Web. Had the web not taken shape at about the same time Java was being implemented, with the emergence of the World Wide Web. Java was propelled to the forefront of computer language design, because the web, too demanded portable programs.

Java Environment

Java Environment includes Classes and Several Methods in the Form Packages or we can also Called them as the Development Tools The Tools those provides us the Facility to create java Applications are also Known as the java Development Kit The Development Kit of the java Includes Several Classes and their methods and properties The Java Development Kit ,name of the Development tools that is used for creating any applications.

Java Development Kit :

Java Development Kit Comes with a collection of tools that are used for developing and Running java programs.

1) Javac :- Compiler used for Compiling java programs.
2) Java :- For Interpreting java programs.
3) Appletviewer :- For Running Applets.
4) Jdb:- For Connecting java to Database.

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