58. Advantage of JAVA II

JAVA is an object oriented programming language and it was intended to serve as a new way to manage software complexity. Java refers to a number of computer software products and specifications from Sun Microsystems that together provide a system for developing application software and deploying it in a cross-platform environment. Java is used in a variety of computing platforms from embedded devices and mobile phones on the low end, to enterprise servers and supercomputers on the high end. Java is nearly everywhere in mobile phones, Web servers and enterprise applications, and while less common on desktop computers; Java applets are often used to provide improved functionality while browsing the World Wide Web.

Some advantages of JAVA:

• It is an open source, so users do not have to struggle with heavy license fees each year

• Platform independent

• Java API's can easily be accessed by developers

 Java perform supports garbage collection, so memory management is automatic

• Java always allocates objects on the stack

• Java embraced the concept of exception specifications

• Multi-platform support language and support for web-services

• Using JAVA we can develop dynamic web applications

• It allows you to create modular programs and reusable codes

Another advantage of JAVA is that, ones the program is written in java we can run it anywhere means that application developed through Java is platform independent. JAVA based enterprise applications perform well because stable JAVA standards help developers to create multilevel applications with a component based approach.

JAVA programming enables secure and high performance software development on multiple platforms. Many companies in India have well-qualified software engineers having expertise in Java, Java Script, J2SE, JSP, and J2ME, JAVA Programming Services help your businesses to do better. They provide variety of Java development services including project solutions.

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57.Types of DNS servers

What is DNS?
DNS is called as Domain name system. DNS is name resolution service in Windows
Server 2003 family which rsolves human friendly name (such as Example Web Page)
into IP address(192.168.0.10) DNS is a hirarchical distributed database that contains
resolving of domain name into IP address.

Why DNS?
Because people and applications try to connect the network computer by specifying
name. DNS has superior scalability,security and compatibility with internet.
Different types of DNS servers are:-
1> Primary DNS server:-
A primary DNS server is created when a primary zone is added. It is a DNS server
which holds primary zones for a perticular domain. Primary DNS server acts as the
zone's central point of update. Newly created zones are always this type.


2> Seconday DNS server:-
It is a DNS server hosting a secondary zone is called as secondary DNS server. That
can be any number of secondary servers for a primary. If primary server is down
then a secondary server provides a name resolution in zone until the primary server
is available.

3> Caching only serves:-
This type of DNS servers does not have any zones in it, and purely depends on
caching. They contain the information of what has been cached while resolving
queries.

4> stub servers:-
It is a DNS server hosting a stub zone. This kind of servers has a copy of a zone
containing only a list of the authoritative DNS servers for its master zone.

5> Forwarders:-
Forwarders is the process of resolving external queries using forwarders. It
reduces network traffic on WAN links. It acts as a firewall which provides a
layer of security from external network.

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56.SEO Tutorial V

Why Backlinks Are Important
The number of backlinks is an indication of the popularity or importance of that website. Backlinks are important for SEO because some search engines like Google, give more credit to websites that have a large number of quality backlinks, and consider those websites more relevant than others in their results pages for a search query.

Therefore, when search engines calculate the relevance of a site to a keyword, they not only consider the number of backlinks to that site but also their quality. In order to determine the quality, a search engine considers the content of the sites. When backlinks to your site come from other sites, and those sites have content related to your site, these backlinks are considered more relevant to your site. If backlinks are found on sites with unrelated content, they are considered less relevant. The higher the relevance of backlinks, the greater their quality.

For example, if a webmaster has a website about how to rescue orphaned dogs, and received a backlink from another website about dogs, then that would be more relevant in a search engine's assessment than say a link from a site about car racing. Therefore, higher the relevance of the site linking back to your website, the better the quality of the backlink.

Search engines want websites to have a level playing field, and look for natural links built slowly over time. While it is fairly easy to modify your webpages to make them more SEO friendly it is a lot harder for you to influence other websites and get them to link to your website. This is the reason search engines regard backlinks as a very important factor. Further, search engine's criteria for quality backlinks has gotten even tougher, thanks to unscrupulous webmasters trying to achieve these backlinks by deceptive or sneaky techniques, such as hidden links, or automatically generated pages whose sole purpose is to provide backlinks to websites. These pages are called link farms, and they are not only disregarded by search engines, but linking to a link farm could get your site banned entirely.

Anchor Text

When a link incorporates a keyword into the text of the hyperlink, we call this anchor text. A link's anchor text may be one of the most powerful resources a webmaster has. Backlinks from multiple websites with the anchor text "orphaned dogs" would help your website rank higher for the keyword "orphaned dogs". Using your keyword is a superior way to utilize a hyperlink as against having links with words like "click here" which do not relate to your website. The 'Backlink Anchor Text Analysis Tool' is a tool which will assist you find your backlinks and the text which is being used to link to your website. If you find that your site is being linked to from another website, but the anchor text is not being utilized properly, you should request that the website change the anchor text to something which incorporates relevant keywords. This will also help boost your rankings.

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55.Waterfall model

Waterfall model is one of the earliest models to be designed. It is a sequential software development process. In waterfall model tasks are executed in a sequential fashion. The progress of software development is seen as a sequence of phases like Requirements->Design->Implementation->Testing->Deployment->Maintenance.

n the waterfall model we start with the feasibility study and move down through the various phases upto Implementation, Testing, Deployment, maintenance and into live environment.

Phases of Waterfall development model.

Requirements
The first phase in waterfall model is requirements gathering, here the end user requirements are captured and feasibility study is done. After this software requirements document(SRS) is prepared.

Design

High level and low level software design is done in this phase.

Implementation
Developers start coding and finish software development in this phase.

Testing
After developers are done with coding and provide final build to testers, testing starts in this phase.

Deployment
After testing is done and software is released it is then deployed in customer environment.

Maintenance
In maintenance phase the maintenance activities are done for the deployed software.

Disadvantages of Waterfall Model

As you can see in waterfall model testing tends to happen towards the end of the project life cycle so defects are detected close to the live deployment date which makes it very difficult to find and fix those defects.
The cost of defects is very high in this model as they are found in the end of the project life cycle.
Requirements need to frozen before any other phase can start.

Software Quality Assurance 

Software Quality Assurance 

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54.Advantage of JAVA

Advantages of JAVA 

JAVA offers a number of advantages to developers.

Java is simple: Java was designed to be easy to use and is therefore easy to write, compile, debug, and learn than other programming languages. The reason that why Java is much simpler than C++ is because Java uses automatic memory allocation and garbage collection where else C++ requires the programmer to allocate memory and to collect garbage.

Java is object-oriented: Java is object-oriented because programming in Java is centered on creating objects, manipulating objects, and making objects work together. This allows you to create modular programs and reusable code.

Java is platform-independent: One of the most significant advantages of Java is its ability to move easily from one computer system to another. 

The ability to run the same program on many different systems is crucial to World Wide Web software, and Java succeeds at this by being platform-independent at both the source and binary levels.

Java is distributed: Distributed computing involves several computers on a network working together. Java is designed to make distributed computing easy with the networking capability that is inherently integrated into it. 

Writing network programs in Java is like sending and receiving data to and from a file. For example, the diagram below shows three programs running on three different systems, communicating with each other to perform a joint task.

Java is interpreted: An interpreter is needed in order to run Java programs. The programs are compiled into Java Virtual Machine code called bytecode. 

The bytecode is machine independent and is able to run on any machine that has a Java interpreter. With Java, the program need only be compiled once, and the bytecode generated by the Java compiler can run on any platform.

Java is secure: Java is one of the first programming languages to consider security as part of its design. The Java language, compiler, interpreter, and runtime environment were each developed with security in mind.

Java is robust: Robust means reliable and no programming language can really assure reliability. Java puts a lot of emphasis on early checking for possible errors, as Java compilers are able to detect many problems that would first show up during execution time in other languages.

Java is multithreaded: Multithreaded is the capability for a program to perform several tasks simultaneously within a program. In Java, multithreaded programming has been smoothly integrated into it, while in other languages, operating system-specific procedures have to be called in order to enable multithreading. Multithreading is a necessity in visual and network programming.

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53.DNS Servers

DNS Server?
The Domain Name System (DNS) is a standard technology for managing the names of Web sites and other Internet domains. DNS technology allows you to type names into your Web browser like compnetworking.about.com and your computer to automatically find that address on the Internet. A key element of the DNS is a worldwide collection of DNS servers. What, then, is a DNS server?
A DNS server is any computer registered to join the Domain Name System. A DNS server runs special-purpose networking software, features a public IP address, and contains a database of network names and addresses for other Internet hosts.

DNS Root Servers

DNS servers communicate with each other using private network protocols. All DNS servers are organized in a hierarchy. At the top level of the hierarchy, so-called root servers store the complete database of Internet domain names and their corresponding IP addresses. The Internet employs 13 root servers that have become somewhat famous for their special role. Maintained by various independent agencies, the servers are aptly named A, B, C and so on up to M. Ten of these servers reside in the United States, one in Japan, one in London, UK and one in Stockholm, Sweden.
DNS Server Hierarchy

The DNS is a distributed system, meaning that only the 13 root servers contain the complete database of domain names and IP addresses. All other DNS servers are installed at lower levels of the hierarchy and maintain only certain pieces of the overall database.

Most lower level DNS servers are owned by businesses or Internet Service Providers (ISPs). For example, Google maintains various DNS servers around the world that manage the google.com, google.co.uk, and other domains. Your ISP also maintains DNS servers as part of your Internet connection setup.

DNS networking is based on the client / server architecture. Your Web browser functions as a DNS client (also called DNS resolver) and issues requests to your Internet provider's DNS servers when navigating between Web sites.

When a DNS server receives a request not in its database (such as a geographically far away or rarely visited Web site), it temporarily transforms from a server to a DNS client. The server automatically passes that request to another DNS server or up to the next higher level in the DNS hierarchy as needed. Eventually the request arrives at a server that has the matching name and IP address in its database (all the way to the root level if necessary), and the response flows back through the chain of DNS servers to your client.

DNS Servers and Home Networking

Computers on your home network locate a DNS server through the Internet connection setup properties. Providers give their customers the public IP address(es) of primary and backup DNS servers. You can find the current IP addresses of your DNS server configuration via several methods:

on the configuration screens of a home network router

on the TCP/IP connection properties screens in Windows Control Panel (if configured via that method)

from ipconfig or similar command line utility

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52.SEO Tutorial IV

Keywords in Page Titles - The page title is another special place because the contents of the <title> tag usually gets displayed in most search engines, (including Google). While it is not mandatory per the HTML specification to write something in the <title> tag (i.e. you can leave it empty and the title bar of the browser will read “Untitled Document” or similar), for SEO purposes you may not want to leave the <title> tag empty; instead, you'd better write the the page title in it.

Unlike URLs, with page titles you can get wordy. If we go on with the dog example, the <title> tag of the home page for the http://dog-adopt.net can include something like this: <title>Adopt a Dog – Save a Life and Bring Joy to Your Home</title>, <title>Everything You Need to Know About Adopting a Dog</title> or even longe

Keywords in Headings - Normally headings separate paragraphs into related subtopics and from a literary point of view, it may be pointless to have a heading after every other paragraph but from SEO point of view it is extremely good to have as many headings on a page as possible, especially if they have the keywords in them.

There are no technical length limits for the contents of the <h1>, <h2>, <h3>, ... <hn> tags but common sense says that too long headings are bad for page readability. So, like with URLs, you need to be wise with the length of headings. Another issue you need to consider is how the heading will be displayed. If it is Heading 1 (<h1>), generally this means larger font size and in this case it is recommendable to have less than 7-8 words in the heading, otherwise it might spread on 2 or 3 lines, which is not good and if you can avoid it – do it.

What are Backlinks - In layman's terms, there are two types of links: inbound and outbound. Outbound links start from your site and lead to an external site, while inbound links or backlinks, come from an external site to yours. e.g. if cnn.com links to yourdomain.com, the link from cnn.com is a backlink (inbound) for yourdomain.com, however the link is an outbound link from cnn.com's perspective. Backlinks are among the main building blocks to good Search Engine Optimisation (SEO).

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51.Iterative Model in Testing

Iterative and Incremental development is any combination of both iterative design or iterative method and incremental build model for development. The combination is of long standing and has been widely suggested for large development efforts."During software development, more than one iteration of the software development cycle may be in progress at the same time." and "This process may be described as an "evolutionary acquisition" or "incremental build" approach." The relationship between iterations and increments is determined by the overall software development methodology and software development process. The exact number and nature of the particular incremental builds and what is iterated will be specific to each individual development effort.


An iterative development model
Software development process
Activities and steps
Requirements Specification Architecture Design Implementation Testing Debugging Deployment Maintenance
Methodologies

Waterfall Prototype model Incremental Iterative V-Model Spiral Scrum Cleanroom RAD DSDM RUP XP Agile Lean Dual Vee Model TDD
Supporting disciplines
Configuration management Documentation Quality assurance (SQA) Project management User experience design
Tools
Compiler Debugger Profiler GUI designer IDE Build automation
v t e
Iterative and incremental development are essential parts of the Modified waterfall models, Rational Unified Process, Extreme Programming and generally the various agile software development frameworks.

Software Quality Assurance 

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50.Features of JAVA III

Multithreaded
As we all know several features of Java like Secure, Robust, Portable, dynamic etc; you will be more delighted to know another feature of Java which is Multithreaded.
Java is also a Multithreaded programming language. Multithreading means a single program having different threads executing independently at the same time. Multiple threads execute instructions according to the program code in a process or a program. Multithreading works the similar way as multiple processes run on one computer.
Multithreading programming is a very interesting concept in Java. In multithreaded programs not even a single thread disturbs the execution of other thread. Threads are obtained from the pool of available ready to run threads and they run on the system CPUs. This is how Multithreading works in Java which you will soon come to know in details in later chapters.

Interpreted
We all know that Java is an interpreted language as well. With an interpreted language such as Java, programs run directly from the source code.
The interpreter program reads the source code and translates it on the fly into computations. Thus, Java as an interpreted language depends on an interpreter program.
The versatility of being platform independent makes Java to outshine from other languages. The source code to be written and distributed is platform independent.
Another advantage of Java as an interpreted language is its error debugging quality. Due to this any error occurring in the program gets traced. This is how it is different to work with Java.

Architecture Neutral
The term architectural neutral seems to be weird, but yes Java is an architectural neutral language as well. The growing popularity of networks makes developers think distributed. In the world of network it is essential that the applications must be able to migrate easily to different computer systems. Not only to computer systems but to a wide variety of hardware architecture and Operating system architectures as well.  The Java compiler does this by generating byte code instructions, to be easily interpreted on any machine and to be easily translated into native machine code on the fly. The compiler generates an architecture-neutral object file format to enable a Java application to execute anywhere on the network and then the compiled code is executed on many processors, given the presence of the Java runtime system. Hence Java was designed to support applications on network. This feature of Java has thrived the programming language.

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