DIFFERENCE BETWEEN JAVA AND JAVASCRIPT.

DIFFERENCE BETWEEN JAVA AND JAVASCRIPT

Key difference betweeen java and javascript.

• JAVA is an  OOP programming languagae while JAVASCRIPT is a OOP scripting language. JAVA creates applications that run in a virtual machine or browser. while JAVASCRIPT code is run on a browser only. JAVA code needs to be compiled while JAVASCRIPT code are all in text.
• JAVA is a statically types language while JAVASCRIPT is a weakly typed language.
• Both the languages are interpreted languages ( unlike c, which is compiled to machine code as per the machine on which they run).
• JAVASCRIPTS supports prototype based objects system, while JAVA is normally typed object system.
• Java has a well developed "package " system, while  javascript package are not predefined. this has impact on sharing and reusing code.
• Both the languages support the fundamental requirements of Object Oriented Programming like Encapsulation, Inheritence, Abstraction and Polymorphism. But one being a "statically"  typed and the other "dynamic" the style and rigor of achieving these are different.
• Both the language support certain aspects of functional programming the recursion, high order function, first class functions . 
• Java has a bigger set of basic data structure (different kinds of maps, lists, Sets ) in built into the language compared to javascript. This might have an impact if we want to implement certain algorithm or optimizations.
• Both the languages are virtual machine based, Unlike C or C++ , in which we submit the program directly to the underlying OS to run, in Javascript and java , we submit the program to the virtual machine to run. the virtual machine is responsible for managing the memory of the program, performing inline optimizations, security of the running programs etc. 

To know  More About These two Languages...
http://technolgydrift.blogspot.com/2018/07/web-development-javascript-about.html
( About Javascript )
http://technolgydrift.blogspot.com/2018/07/programming-language-java-about-java.html
( About JAVA )

Some Major Differences..

Compiled vs. Interpreted 
                      Java is considered a compiled  programming language. javascript is considered as                                interreted scripting language. The difference is in the implementation. Java is compiled                        into byte code and run on a virtual machine. whereas javascript can  be interpreted                                directly by a browser in the syntax it is written.

Static vs Dynamic Type Checkin

  Java uses static type checking where the type of a variable is checked at compile time.                          The programmer must specify the type ( integer, string, double etc) of any variable they                        create . Javascript, like most scripting language, use dynamic type, where type satisfy                          isverified at run time. It is not required for a programmer to specify the type of any                              variable they create. There are many pros and cons for these two paradigms, but the                              primary advantage of static type checking is that type errors are caught in early                                    development and compiler knows exactly what data type are being used, code typically                        execute faster or uses less memory. The primary advantage of dynamic type checking                           isprogrammer productivity you are free to assign types at your leisure.

Class Based vs Prototype Based.

                      Java follows class based inheritence a top down, hierarichal, class based relationship                            whereby properties are defined in a class and inherited by an instance of that class. In                           Javascript, inheritence is prototypal -all objects can inherits directly from other                                   objects. Hierarchy is accomplished in Javascript by assigning an object as a prototype                            with a constructor function.

 

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PROGRAMMING LANGUAGE JAVA

PROGRAMMING LANGUAGE (JAVA)

About  JAVA ..

• Java is a case sensitive language.
• Java is nearly 100% object oriented language.
• In JAVA, it is not possible to make a function which is not a member of any class.

If you know more about any languages such as C, C++, Javascript, HTML, CSS, PHP) so please click on these link .
http://technolgydrift.blogspot.com/2018/07/web-development-html-introduction-to.html
( About HTML )
http://technolgydrift.blogspot.com/2018/07/web-development-css-what-is-css-css.html
( About CSS )
http://technolgydrift.blogspot.com/2018/07/web-development-javascript-about.html
( About Javascript )
http://technolgydrift.blogspot.com/2018/07/web-development-php-about-php.html
( About PHP )

HISTORY of JAVA

• Java was developed by james Gosling  at Sun Microsystem, inc.
• Java originated at Sun Microsystems, inc.in 1991.
• Vinod Khosla was the Co-founder of Sun Microsystems.

http://technolgydrift.blogspot.com/2018/06/introduction-programming-language.html

Importance of JAVA.

• Java resides in obiles, client machines, server machines, embedded devices, smart phones, cloud etc.
• It shares the same basic features of the language and libraries.
• Principal of JAVA : Write Once, Run Anywhere(WORA).

What is Library 

• Java library is as collection of predefined classes.
• You can use these classes either by inheriting them or by instanting them. 

JAVA Flavours (Types)

1. JAVA SE ( core java)
2. JAVA EE ( Advanced java)
3. JAVA ME (Micro edition for mobiles)

FEATURES OF JAVA

• Simple.
• Object Oriented Language.
• Distributed.
• Interpreted.
• Robust.
• Secure.
• Portable.
• Multi-threaded.
• Garbage Collector.

Data Tpyes..

• A type identifies a set of value(and their representation in memory) and a set of operations that perform these values into other values of that set.
• JAVA is stronglt typed language.

PRIMITIVE TYPE Data Type

These are the Data Types of java programming.

 In this each data type has own meaning such as 

1. boolean       Its just check statement is true or false.
2. char             Its use for single characters ( 'A').
3. short            Its use to store for real numbers in only 2 btye. ( 1 byte = 8 bits)
4. int                Its also use for store to real number in 4 bytes. 
5. long             Its also use for store to real number in 8 bytes.
6. float             Its use to store decimal (floating number such as 4.8, 3.5) values in 4 bytes. 
7. double         Its used for store both real and decimal number in 8 bytes.

Examples:

•  int x;
• double temp;
• string name;
• int [] ages;
• char letters[];

CONSTANTS

• integer constants consists of a sequence of digits.
• If the constants is to represent a long integer value, it must be suffixed with an uppercase L or lowercase l.
• If there is no suffix the constant represent 32 3bit integer (an int).
• Integer constants can be specified in the decimal , hexadecimal, octal, or binary format.

               127           ( deciaml number )

               0x7f          ( hexadecimal ) there is 0x is just a sign to show hexadeciaml number and f = 15 

               0122          ( octal )  there is 0 is just to show octal number 

              0b01010110       ( binary ) there is 0b is just to show that it is in binary. and binary number is                                                 always written in 0 and 1 .  

CONVERSION  IN JAVA

• Every expression written in the java programming language has a type that can b decuded from the structre of the expression and the types of the literals, variables, and methods mentioned in the expression.

Permitted Conversions 

• byte to short, int, long, float or double.
• short to int, long , float or double.
• char to int, long float or double.
• int to long, float or double.
• long to float or double.
• float to double.

Example

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WEB DEVELOPMENT SCRIPTING LANGUAGE PHP

WEB DEVELOPMENT (PHP)

About PHP.

• PHP is a server side scripting language.
• PHP is a powerful tool for making dynamic and interactive web pages.
• PHP is a language for creating interactive web sites and is used on over 4 million web sites around the world.
• PHP file can contain text,HTML tags and scripts.
• PHP files are returned to the browser as plain HTML.
• PHP files have a file extension of ".php" .
• PHP can run on different platforms(Windows, Linux, Unix, etc).
• PHP is compatible with almost all servers used today(Apache, IIS, etc).

Friends before read this i want you know about web development course and its languages such as HTML CSS Javascript. You find all these in these link after understand all these then learn about PHP  

http://technolgydrift.blogspot.com/2018/06/web-development-web-development.html
(About Web Development Course )
http://technolgydrift.blogspot.com/2018/07/web-development-html-introduction-to.html
(About HTML Basic)
http://technolgydrift.blogspot.com/2018/07/web-development-css-what-is-css-css.html
(About CSS Basic)
http://technolgydrift.blogspot.com/2018/07/web-development-javascript-about.html
(About Javascript Basic )

Why PHP ?

• Easy to Learn.
• Best suited for rapid application development.
• Easy to implement.
• PHP community is a big support for the programmers
• Runs on almost every platforms
• It is free.

WAMP : Windows Apache MySQL PHP  (This is for windows It is a software that contain Apache MySQL and PHP it is a package of all these three.)

LAMP : Linux Apache MySQL PHP . (This is for Linux It is a software that contain Apache MySQL and PHP it is a package of all these three.)

PHP HISTORY

• Earlier it was Personal Home Page.
• Now a days it is PHP: Hypertext preprocessor.
• It was created in 1994 byRasmus Lerdorf.

PHP Basic Syntax

• PHP files have a file extension of ".php" .
• PHP file may contain.

1. HTML (Everything in HTML code in the file by default)
2. CSS (code in style tag)
3. Javascript(code in script tag)
4. PHP  (code in <?php...?> ).

PHP Script

• PHP script can be used any number of times in the php file.
• Every piece of PHP in the page is enclosed in <?php...?>

PHP VARIABLES

• Vaiables are used to store constants.
• These constants could be strings, numbers, or arrays.
• When a variable is declared,it can be used over and over again in your script.
• All variables in PHP start with a $ sign symbol.

            Syntax.....       <?php   ( opening of PHP )
                                   $txt = "Computer";    ( variables that start with $ sign )
                                   $x = 4;
                                   ?>   (closing of PHP )

• In PHP, the variables is declared automatically when you use it.

Name Rules 

• A variable name must start with an alphabet or an underscore "_" .
• A variable name can only contain alphanumeric characters and underscores (a-z, A-Z, 0-9, and _ )..
• A variable name should not contain spaces.
• In PHP, a variable does not need to be declared before adding a value to it.
• PHP automatically converts the value to correct data type, depending on its value.

PHP has Four Different Variables Scopes.

1. Local 
2. Global
3. Static
4. Parameter

LOCAL SCOPE

• Program will not generate any output.
• The echo statement refers to the local scope variable $x
• You can have local variables with the same name in different functions, because local variables are  only recognised by the function in which they are declared.
• Local variables are deleted as soon as the function is completed.

GLOBAL SCOPE

• A variabl that defined outside of any function,has a global scope.
• To access a global scope variable from within a function, use the global keyword
• PHP also stores global variables in an array called $GLOBAL[index]
• The index holds the name of the variable.
• This array is also accessible from within functions and can be used to update global variables directly.

STATIC SCOPE

• When a function is completed, all of its variables are normally deleted.
• Some times you want a local variable not to be deleted.
• To do this, use the static keyword when you first declare the variable.
• The variable is still local to the function.
• Each time the function is called, that variable will still have the information it contained from the last time the function was called.
• So the life og static variable is the php page.

PARAMETER SCOPE

• A parameter is a local variable whose value is passed to the function by the calling code
• Parameters are declared in a parameter list as part of the function declaration...

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WEB DEVELOPMENT LANGUAGE JAVASCRIPT

WEB DEVELOPMENT (JAVASCRIPT)

About JAVASCRIPT

• Javacsript is a high level,un typed and interpreted programming language.
• Despite some naming,syntatic and standard library similarities, javascript and java are otherwise unrelated.
• javascripts statements are separated b semicolons.
• Javascript statements are composed of : value, operators Expressions, Keywords, and Comments.
• Javascript used in web pages to add functionality, validate forms, communicating with server and read write HTML elements.
• Javascript is a client side scripting language.

HISTORY OF JAVASCRIPT

• Javascript was created in 10days in May 1995 by Brendan Eich, then working at Netscape and now on Mozilla.
• The original name of javascript was Mocha(name chosen by founder of Netscape).
• In September 1995, name changed to Livescript .
• Again in December 1995, name changed to Javascript.

JAVASCRIPT INTERPRETER

• As a browser goes through the javascript,it passes it to a special program called interpreter which convert the javascript to the machine code your computer understands.
• Browsers equipped with javascript Interpreters.

JAVASCRIPT in  HTML File.

• Javascript code must be inserted between <script>and </script> tags.
• Script can be placed anywhere in HTML document.(body or head).
• <script type="text/javascript"></script>
• The type attribute is not required. Javascript is the default scripting language in HTML.

Where to Write Code.

• In the same HTML file
• In a separate file, which can be embedded into HTML file.

In External File

•  In External File script cannot contain the <script></script>  tags.

Where We Can Write JS.

• In head tag.
• In body tag.
• In external file.
• In JS function.
• In events attribute value.

Javascript syntax........

  <html >     

    <head>

     <script>        (javascript <script> tag open)

      document.write("ROHIT");         (In javascript document.write is a statement we wite it to print                                                                      anything on screen  in this ROHIT is printed on screen)

    </script> (closing tag)

  </head>

  <body>

   <h1>Home Page</h1>

  <script>

   document.write("YADAV");

 </script>

   <p>This is a javascript page</p>

  </body>

</html>
http://technolgydrift.blogspot.com/2018/07/web-development-html-introduction-to.html


http://technolgydrift.blogspot.com/2018/06/web-development-web-development.html

Friends if you cannot understand about is so firstly you will be know HTML and CSS and in a WEB DEVELOPMENT cousre you will need to understand all of these languages. So firstly start from HTML, CSS and then Javascript.
And i will provide you my best..


Javascript Variables

• Variables are used to store data values.
• The var keyword is used to declare variables. 
•        var x=5;
• JS varaiables are containers for storing constants.
• The keyword var is used to declare variables.

               Example     var x=4;
                                  var y=3.5;
                                  var z="Hello";
                                  var a=3+x;

Javascript Keywords
var is a keyword.
As of now there are 63 keywords in JS.

Friends javascript is a very easy and basic conceptual language and easy to learn.
and remain all topics of javascript is coming soon in next blog.

http://technolgydrift.blogspot.com/2018/07/web-development-php-about-php.html
( Want to know About PHP click on this link )

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WEB DEVELOPMENT LANGUAGE CSS

WEB DEVELOPMENT  (CSS)

What is CSS ?

• CSS stands for Cascading Style Sheet.
• CSS defines how HTML elements are to be displayed on screen, paper, or in other media 
• CSS saves a lot of work. I tcan control the layout of multiple wep pages all at once.
• External stylesheets are stored in CSS files.

Why Use CSS ?

• CSS is used to define styles for your web pages ,including the design, layout and variation in display for different devices and screen sizes.

CSS solved  A Big Problem...

• HTML was never intended to contain tags for formatiing a web page.
• HTML was created to describe the content of a web page, like:
• <h1> This is Heading</h1>
• <p> This is a paragraph</p>
• 
  
• When tags like <font> and color attributes,were added to HTML it startes a nightmare for web developers> Development of large websites, where font and color ingormation were added tov every single page become a long and expensive pages.
• To solve this problem, the World Wide Web Consortium(W3C) created CSS. 

Where To Write CSS ?

• We can write CSS in a separate file and link it to our HTML file or embed CSS in HTML file itself.

1. External Style Sheet
2. Internal Style Sheet
3. Inline Style

EXTERNAL STYLE SHEET..

•     External style sheet means when CSS is written in a another CSS file linked to HTML file.
• <style> tag must be used to write CSS in another CSS file.
• Their is  specification of type (text/css).

Syntax..                                                                                             

(html file linkes to css file by stylesheet rel)                                          my.css (file)

  <html>                                                                                            body{

<head>                                                                                                      background-color: green;

<link rel= "stylesheet" type="text/css" href = "my.css">                          }

</head>                                                                                             h1{

<body>                                                                                                     background-color: red;

<h1>ROHIT</h1>                                                                                 }

</body>

</html>                                                                   ANS is     ROHIT

                  

INTERNAL STYLE SHEET

• Internal style sheet means when CSS is included in the same html file.
• <style > tag must be used to write css in html file.
• <stye> tag shoule be in <head> tag.
• Type attribute of style tag specify the type of MIME type (text/css).
• Internal style sheet is useful when page specific properties need to be applied.
• Preference is given to Internal style sheet over External style sheet.

Syntax...

<html>

<head>

  <style>

    p{

       background-color: green;

      }

    body{

             background-color: red;

      }

  </style>

</head>

<body>

<p>ROHIT</p>

</body>

</html>

ANS is   ROHIT

INLINE STYLE SHEET

• Style attribute can be used with tag representing html element
• The value of style attribute is any CSS property
• Example (<h1 style="color:green;text-decoration: underline;">This is Heading </h1>
• Each property name-value pair is terminated with a semicolon.
• Inline style has more preference given than Internal or External style.
• Inine style is useful when element specific property need to be applied.

Syntax...

<html>

<head>

<style>

p{

background-color: yellow;

}

</style>

</head>

<body>

<p style="background-color: red;">HTML</p> 

</body>

</html>

ANS is  HTML

Background color is red because yellow color is in internal style sheet but red is in inline style sheet.

CSS representation

http://technolgydrift.blogspot.com/2018/07/web-development-javascript-about.html
( Want to know About Javascript  click on this link ).

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WEB DEVELOPMENT LANGUAGE HTML

WEB DEVELOPMENT  (HTML)

INTRODUCTION TO HTML

• HTML is a markup language that web browsers  use to internet and compose text, images and other material into visual or audible web pages.
• It is not a programming language.
• HTML is case sensitive language.
• HTML uses markup tags to define a web page.
• HTML file has an extension .htm or .html .
• HTML is developed by World wide web consortium.

ADVANTAGES..

• No need of any programming language background.
• You need a web browser installed on your machine and a text editor like note pad.
• Web browsers are Internet explorer, Google chrome, Opera, Mozilla Firefox etc.

Where toWrite ?

• You need to open notepad,open a new file and write html code in it.
• Save it with html extension.
• Execute it with some browser.
• You can reopen HTML file with notepad to make any edition.

HTML TAGS

  Title tags

•   It is written in <head> tag.
• The <title> tag defines the title of the document.
• It defines a title in the browser toolbar.
• It provides a title for the page when it is added to favorites.
• It displays a title for the page in search engine result.

Heading tags

• Headings are defined with the <h1> and  <h6> tags
• <h1> defines the most important heading.
• <h6> defines the least important heading.
• Search engines use your heading to index the structure and context of your web pages.

Paragraph tag

• Paragraphs are defined with the <p> tag.
• Browsers automatically added an  empty line before and after a paragraph.

Formatting tags

• <br/> Break line.
• <hr/> Horizontal line.

In this table you can see many type of tags with their starting and Ending .. these are used for a text to give a better look and use as when they required.

HTML Elements.

• An HTML element is an endividual component of an HTML document.
• It start with a start tag / opening tag and ends with an end tag / closing tag.
• The element content is everything between the start and the end tag.
• Most HTML element can have attributes.

http://technolgydrift.blogspot.com/2018/07/web-development-css-what-is-css-css.html
( Want to  know about CSS) click on this link.

https://chat.whatsapp.com/LQwOhM1jvx25uNG5LXxU2f
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WEB DEVELOPMENT LANGUAGES (HTML, CSS, JAVASCRIPT, PHP)

WEB DEVELOPMENT

Web Development Languages

1. HTML.
2. CSS.
3. JS(Javascript).
4. JQuery.
5. PHP.
6. MySQL.

 Know more about these languages.
http://technolgydrift.blogspot.com/2018/07/web-development-html-introduction-to.html
( About HTML )
http://technolgydrift.blogspot.com/2018/07/web-development-css-what-is-css-css.html
 ( About CSS )
http://technolgydrift.blogspot.com/2018/07/web-development-javascript-about.html
 ( About Javascript)
http://technolgydrift.blogspot.com/2018/07/web-development-php-about-php.html
(  About PHP )

By helping of all these languages you can make a Website. a website is a group of web pages that linked to each other by tags. Make a website and web pages is called Web Development..

All of these languages are linked to each other by tags to perfom separate task. Each and Every language can perform a unique role to make a well built and well performed web pages and websites.

A websites contain many things such as linked web pages, Web browser, web server. etc.

WEB  PAGES
A Web page is a plain text document with formatting instructions of Hyper Text Markup  language(HTML), which is interpreted by Web browser..

Web pages are transported and accessed by Hyper Text Transfer Protocol(HTTP).

                                                                                                          <html>
                                                                                                             <head>
                                                                                                             </head>
                                                                                                             <body>
                                                                                                             <......../>
                                                                                                              </body>
                                                                                                           </html>.


Dynamic Web Page

• A dynamic web page is generated by some web application.
• Dynamic web page displays user specific content.
• They are generated by program which could be written in PHP.                     

Static Web Page

• A static web page is a web page that is delivered to the user exactly as stored.
• Static Web page displays the same information for all users,from all contexts.
• Static web page are often HTML documents stored as file in the file system and made easily availabe by the web server over http.           

WEB SERVER

• The primary function of web servers is to deliver web pages in the rquest to client.
• This means delivery of HTML documnets and any additional content that may be included by a document such as images , Style sheet and javascripts.
• Web server can refer to either hardware or the software that help to deliver content that can  be accessed through the internet.
• USe of web server is to host web sites,data storage and enterprise applications.                            
• Apache is the mot commonly used web server software(accordint to Netcraft statistics) and Microsoft's Internet Information Services(IIS) is also commonly used.    

WEB BROWSER

• A web browser is a software application for retrieving,presenting and travelling information resources on the World Wide Web.
• Each resources on World Wide Web is identified by uniform resource locator(url).
• Examples of browser are Mozilla Firefox, Google Chrome, Internet explorer, Opera, Safari, etc

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PROGRAMMING LANGUAGE PART- II

PROGRAMMING LANGUAGE PART- II

JAVASCRIPT
Javascript reamins as popular this year as it was last year. Which is not a surprise, as it is used by over 80% of developers and by 95% of all websites for any dynamic logic on their pages according to Coding Dojo. " Several front end frameworks for javascripyt such as React and Angular have huge future potential as Iot and Mobile devices become more popular, So we Doubt we'll see javascript drop in popularity anytyime soon"...Read More.

http://technolgydrift.blogspot.com/2018/07/web-development-javascript-about.html
( Want to know more about javascript click on this link ).
C#
C# fell in job demand slightly this year. An Object Oriented language from Microsoft Designed to run on the .NET platform, Its is also heavily used in video game Development. C# 7.2 came out in November 2017. and added several new features aimed at avoiding unecessary copying....Read More.


PHP
PHP moved from no.9 in the ranking last year to no. 6 this year. Most developers use this scripting language to add functions that HTML can't handle or to interact with MySQL databases...Read More.
http://technolgydrift.blogspot.com/2018/07/web-development-php-about-php.html
( Want to know more about PHP click on this link ).

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PROGRAMMING LANGUAGES

  INTRODUCTION:  PROGRAMMING LANGUAGE

Friends Programming language is a language that can take decision by decision control statement like if else, loops.

Software Development is a dynamic field, in which new Programming langyuages and frameworks and technologies may work. That being the case Developers need to learn constantly new skills to remain relevant.

Examining job demand is one useful way to measure a programming language popularity.because it shows Developers the skill will they need to improve their carrier prospects.

Coding Dozo recently analyzed hundreds of thousands of job posting on job search engine indeed.

JAVA

Java increased in popularity by 6,000 jobs posting going into 2018 compared into 2017.

However it is still an extremely well established programming language,used by millions of developers and billions of devics worldwide. Additionaly,all Androids apps are based on java, and 90% of fortune companies use java as a server side language for beckend development......Read More.
http://technolgydrift.blogspot.com/2018/07/programming-language-java-about-java.html
 ( Learn more about JAVA )

http://technolgydrift.blogspot.com/2018/07/java-basic-operators-java-provides-rich.html
( Want to more about JAVA click on this link ).

PHYTON

Phyton grew in popularity by means about 5,000 job posting since last year. is commonly used in scientific computing, data mining and machine learning- and the growth in demand for machine learning developers in particular may be driving some of  its popularity....Read More.
http://technolgydrift.blogspot.com/2018/07/phyton-programming-language-and-its.html
( Want to know more about Phyton click on this link ).

C++

C++, remained as popular as it was in nearly 2017. the language is usually used for system/application software, game development, drivers, client server applications and embedded firm-ware. throughv many programmers find C++ to be complex to learn and use, and perfer phyton or javascript, it remains in use in many legacy systems at large enterprises according to coding Dojo...Read More.


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