Software Environment
Java Technology
Java technology is both a programming language and a platform.
The Java Programming Language The Java programming language is a high-level language that can be characterized by all of the following buzzwords:
Simple
Architecture neutral
Object oriented
Portable
Distributed
High performance
Interpreted
Multithreaded
Robust
Dynamic
Secure
With most programming languages, you either compile or interpret a program so that you can run it on your computer. The Java programming language is unusual in that a program is both compiled and interpreted. With the compiler, first you translate a program into an intermediate language called Java byte codes —the platform-independent codes
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We’ve already mentioned some of the most popular platforms like Windows 2000, Linux, Solaris, and MacOS. Most platforms can be described as a combination of the operating system and hardware. The Java platform differs from most other platforms in that it’s a software-only platform that runs on top of other hardware-based platforms.
The Java platform has two components:
• The Java Virtual Machine (Java VM)
• The Java Application Programming Interface (Java API)
You’ve already been introduced to the Java VM. It’s the base for the Java platform and is ported onto various hardware-based platforms.
The Java API is a large collection of ready-made software components that provide many useful capabilities, such as graphical user interface (GUI) widgets. The Java API is grouped into libraries of related classes and interfaces; these libraries are known as packages. The next section, What Can Java Technology Do? Highlights what functionality some of the packages in the Java API provide.
The following figure depicts a program that’s running on the Java platform. As the figure shows, the Java API and the virtual machine insulate the program from the
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If you’ve surfed the Web, you’re probably already familiar with applets. An applet is a program that adheres to certain conventions that allow it to run within a Java-enabled browser.
However, the Java programming language is not just for writing cute, entertaining applets for the Web. The general-purpose, high-level Java programming language is also a powerful software platform. Using the generous API, you can write many types of programs.
An application is a standalone program that runs directly on the Java platform. A special kind of application known as a server serves and supports clients on a network. Examples of servers are Web servers, proxy servers, mail servers, and print servers. Another specialized program is a servlet. A servlet can almost be thought of as an applet that runs on the server side. Java Servlets are a popular choice for building interactive web applications, replacing the use of CGI scripts. Servlets are similar to applets in that they are runtime extensions of applications. Instead of working in browsers, though, servlets run within Java Web servers, configuring or tailoring the
eMILPO uses webservers and application servers as part of the hardware to run this system. The system uses Dell servers running Microsoft Windows 2000 Advanced Server or Microsoft Windows Enterprise Server. The software that the eMILPO System uses to run their web application and the servers that are u...
Virtualization is a technology that creates an abstract version of a complete operating environment including a processor, memory, storage, network links, and a display entirely in software. Because the resulting runtime environment is completely software based, the software produces what’s called a virtual computer or a virtual machine (M.O., 2012). To simplify, virtualization is the process of running multiple virtual machines on a single physical machine. The virtual machines share the resources of one physical computer, and each virtual machine is its own environment.
Parameters served as part of the interface of a subroutine or method (Eck, 2014). Although I am not a beginner, the fundamental meanings and application of parameter with respect to methods or subroutine is a necessary thing to know. I am very grateful for this. The reading assignment makes exclusive elaboration of the return values and Application Programming Interface (API). Sincerely, I never thought that the java packages have some already made modules for Graphical User Interface (GUI).
Additionally, Java Servlet technology is employed to develop certain modules. Java Servlet is a server side procedure, which can respond HTTP requests from the client side. It provides a simple, consistent mechanism for extending the functionality of a web server and for accessing existing business systems (Vandana, 2001). In this project, the printing functionality is developed based on Java Servlet. When a client wants to print the current map and sends the request to the server, the print server will run the print servlet on the server side and respond the client with the requested map in PDF format. The use of Java Servlet can further transfer computing load from the client side to the server side in order to make the client perform only simple tasks, such as sending requests and downloading PDFs.
The Ada language is the result of the most extensive and most expensive language design effort ever undertaken. The United States Department of Defense (DoD) was concerned in the 1970¡¦s by the number of different programming languages being used for its projects, some of which were proprietary and/or obsolete. Up until 1974, half of the applications at the DoD were embedded systems. An embedded system is one where the computer hardware is embedded in the device it controls. More than 450 programming languages were used to implement different DoD projects, and none of them were standardized. As a result of this, software was rarely reused. For these reasons, the Army, Navy, and Air Force proposed to develop a high-level language for embedded systems (The Ada Programming Language). In 1975 the Higher Order Language Working Group (HOLWG) was formed with the intent of reducing this number by finding or creating a programming language generally suitable for the department's requirements.
The programming language C++ can be used in many ways. It has exploded into the gaming community allowing PC game programmers to have access to a stabile, yet powerful, programming language, utilizing as little code as possible. It has also been used in other commercial software, such as word processors, audio players, screen savers, and other computer desktop tools.
The application data is stored in a SQL database which can be accessed and modified using SQL queries and commands. The application also uses the Java API, Java Server Pages. Javascript is used to create database scripts which has the primary purpose of displaying data retrieved from the SQL database in a presentable
The Arduino IDE is a cross-platform application written in Java, furthermore is derived from the IDE for the Processing programming language and the Wiring project. It is intended to introduce programming to artists and other apprentice unfamiliar with software development.
itself. It may be safe to assume that the software is just a large array of
A readable language allows students to, after only a very short time, take educated guesses at the meanings of constructs. Producing an object-oriented program that is readily understandable to students is a real challenge. (KÖlling 1999; 6, 10, 11, 14) Consider the following remarks by programmer Chad Columbus:
Many different types of programming languages are used to write programs for computers. The languages are called "codes". Some of the languages include C++, Visual Basic, Java, XML, Perl, HTML, and COBOL. Each of the languages differs from each other, and each is used for specific program jobs. HTML and JAVA are languages used to build web pages for the Internet. Perl and XML can produce codes that block students from getting on certain inappropriate web pages on their school server. One of the most prominent programming languages of the day would have to be C++.
The classic web application model works like this: Most user actions in the interface trigger an HTTP request back to a web server. The server does some processing retrieving data, crunching numbers, talking to various legacy systems and then returns an HTML page to the client. It's a model adapted from the Web's original use as a hypertext medium, but as fans of The Elements of User Experience know, what makes the Web good for hypertext doesn't necessarily make it good for software applications.
Within this report is information on how Java Script is used on the Internet. This report will contain information that will help you learn about Java Script and its uses on the Internet. It mentions what Java Script is, where it originated and what some of its uses are.JavaScript is a loosely typed scripting language that resembles the programming language C. It is designed to be an extension to HTML and is usually included within HTML scripts. Java Script is object-oriented and has block-structuring features. The main feature of Java Script is that it lets you build interactive web pages.
Software, such as programming languages and operating systems, makes the details of the hardware architecture invisible to the user. For example, computers that use the C programming language or a UNIX operating system may appear the same from the user's viewpoint, although they use different hardware architectures. When a computer carries out an instruction, it proceeds through five steps. First, the control unit retrieves the instruction from memory—for example, an instruction to add two numbers. Second, the control unit decodes the instructions into electronic signals that control the computer.
Operating systems work in two ways, by managing the hardware and software resources of the computer. Managing the hardware and software resources, is important because different programs and input methods go through the central processing unit (CPU) and both take up memory, storage and input/output bandwidth for their own purposes. Secondly, providing a consistent application interface, is critical if there is more than one of a specific type of computer using the same operating system, or if the computer’s hardware can be updated. A consistent application program interface (API) creates a way for a software developer to write an application on one computer and know that it will run on another of the same type, even if the memory and storage are different between computers.