The INTERNET is a network of computers, which links many different types of computers all over the world.
Basic Services Of The INTERNET
§ Electronic Mail (E-Mail) –
Allow user to send a mail (message ) to another internet user in any part of the world in a near-real-time manner .
§ File Transfer Protocol (FTP) –
Allow user to move a file from one computer to another on the internet.
§ Telnet –
Allow a user to log into another computer somewhere on the internet .
The World Wide Web (WWW)
§ World Wide Web or W3 is the most popular and promising method of organizing and accessing information on the INTERNET.
§ Hypertext is a new way of information storage and retrieval that enables authors to structure information in novel ways.
§ A properly designed hypertext document can help users to locate desired type of information rapidly.
§ Hypertext documents enable this by using a series of link.
§ A link is a special type of item in a hypertext document connecting the document to another document.
§ Hypertext documents on internet are known as Web Pages.
Some important current strategic of the INTERNET are :
q On-line communication
q Software sharing
q Exchange of views on topics of common interest
q Posting of information of general interest
q Organization promotion
q Product promotion and feedback about products
q Customer support service
q On-line journals, magazines, Encyclopedia, and dictionary
q On-line shopping
q World-wide conferencing
Understanding Assignment Statements
•An assignment statement sets a value within a variable
•All assignment are considered to be expression statements
•Expressions in Java are anything that has a value
•Typically, expressions evaluate to primitive types
•Commonly known simply as assignment statements, are designed to assign values to variables and must be terminated with a semicolon
Variable = value;
•On the left is the variable that will be associated with the memory and type necessary to store the value. On the right is a literal value.
The if conditional Statement
•The if statement is designed to conditionally execute a statement or conditionally decide between a choice of statements.will execute only one statement upon the condition, unless braces are supplied. Braces allow for multiple enclosed statements to be executed. This group of statements is also known as a block,evaluate to a boolean value,The elseclause is optional and may be omitted
The if-then conditional Statement
•The if-then statement is used when multiple conditions need to flow through a decision-based scenario
The if-then-else conditional Statement
•The main difference is that the code will fall through to the final stand-alone else when the expression fails to return true for any condition
The switch conditional Statement
•It is used to match the value from a switch statement expression against a value associated with a case keyword. Once matched, the enclosed statements associated with the matching case value are executed, unless a break statement is encountered
. Understanding Iteration Statements
•Iteration statements are used when there is a need to iterate through pieces of code
•Iteration statements include for loop, enhanced for loop, and the while and do-while statements.
The for loop Iteration Statement
•The expression within the for loop must be evaluated to aboolean value
•The iteration, also known as the update part, provides the mechanism that will allow the iteration to occur
The enhanced for loop Iteration Statement
•It is used to iterate through an array, a collection, o
r an object that implements the interface iterable.
•It is also commonly known as the for each loop
The while Iteration Statement
•This loop evaluates an expression and executes the loop body only if the expression evaluates to true
The do-while Iteration Statement
•It is very similar to the while loop, except that it always executes the body at least once
4. Understanding Transfer of Control Statements
•Transfer of control statements include the break, continueand return statements
HTML
Numbered lists have <ol> tags instead of <ul> tags.
To separate single list items use <li> and </li> tags.
There are special settings that you can use to customize the lists on your page.
On the following two pages you can learn in detail about bulleted and numbered lists.
žWeb pages are text files containing HTML
žHTML – Hyper Text Markup Language
›A notation for describing
–document structure (semantic markup)
–formatting (presentation markup)
›Looks (looked?) like:
–A Microsoft Word document
žThe markup tags provide information about the page content structure
žAn HTML file must have an .htm or .html file extension
žHTML files can be created with text editors:
›NotePad, NotePad ++, PSPad
Or HTML editors (WYSIWYG Editors):
›Microsoft FrontPage
›Macromedia Dreamweaver
›Netscape Composer
›Expression Web
žHTML is comprised of “elements” and “tags”
›Begins with <html> and ends with</html>
›When writing XHTML, must define a namespace
žElements (tags) are nested one inside another:
žTags have attributes:
HTML describes structure using two main sections
<head> and <body>
Now we are able to start learning about HTML tags. An HTML tag will always begin with a "less than" sign, like this: <. The tags will end with a "greater than" sign, like this: >. An example would be the tag used to underline text, <u>. You would place this before the text you want to underline. This is called an opening tag, which begins the operation you wish to perform. In order to end the underlining, you must use a closing tag. A closing tag will be the same as the opening tag, but will have a forward slash before the command, like this: </u>. So, if you would like to underline the phrase "HTML Rules!", you would write the following in your text editor:
<u>HTML Rules!</u>
The result of this would be:
HTML Rules!
In the past, not all tags would require a closing tag. An example would be the image tag, which places an image on the page. It looks like this:
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