java qr code scanner download INTRODUCTION in Java

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INTRODUCTION
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Are there other reasons for using Java in small things Well, in some cases, Java may be the only way to deploy an application to a device. For example, some cell phone manufacturers support only Java. When considering what programming language to use for applications that run on small devices, you may also want to consider what programming languages you already use on the larger devices and systems. If you already have Java applications running on your servers and desktop systems, putting Java in small devices eliminates the use of another language in your development environment. Furthermore, it may also lead to some code reuse opportunities. 1.5.2 Java s beneficial features Java has a lot to offer. Beyond Java s platform independence, it has a number of features that make it an attractive programming language. These features make Java a likely candidate for software applications regardless of the size or shape of the target platform. Secure Security was a concern to the designers and developers of Java from the beginning. Even in the development of a programming language initially intended for consumer electronic devices, the developers knew that these devices were going to be networked and therefore vulnerable to malicious attacks from other systems on the network. As Java came to be the programming language of the Web, and because security was built into Java from the beginning, it is well suited to address the security issues associated with the Internet. Reliable Java s reliability stems from not having to manage some of the lower-level resources such as memory and pointers. Developers are then able to manage information as an object or set of objects, in a manner more akin to how it is done in the real world. Low-level resources like pointers tend to be the often forgotten, memory-busting programming items that cause memory leaks and inadvertent memory access in software applications. Java places the burden of managing references to memory on a garbage collection system where these memory references will be more methodically maintained than in languages such as C++ where the burden is on the programmer. Object-oriented Java is considered a true object-oriented language. Why is being an object-oriented language important For starters, object-oriented applications are considered easier to build and maintain. This is because object-oriented programming structures actively encourage developers to organize applications into easy-to-understand, manageable pieces. Large complicated applications are then tackled by assembling many smaller and more digestible pieces. These pieces or, more appropriately objects, contain both
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THE CASE FOR JAVA
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behavior and data. Keeping the data and the behavior in an object helps insure that only the code responsible for the data can change the data. Finally, objects, as representations of things in the real world, tend to allow more people to take part and understand the inner workings of the application. In other words, objects tend to be self-documenting in nature. A businessperson may not understand what a two-page function or procedure does, but he or she may have a pretty good idea of what a Savings_Account object does. Free Everyone likes free stuff. Programmers and managers of programmers are no exception. The basic Java development and runtime environments are free. A reference implementation of the J2ME and set of development tools are available from Sun s Java web site (www.java.sun.com). This is not to say that all Java development and runtime environments are free. Sun maintains control of Java. They offer the basic reference implementations, development tools, class API, and runtime environment for free. However, should you require features outside of the basic environment, you may find yourself outside of the free license agreements. Furthermore, integrated development environments (IDE), server systems, test tools, and a myriad of other tools and products that a development team may want to have in order to make themselves more productive and provide a better quality product are usually not free. The important point, though, is that learning the language, and developing your first application in Java costs little or nothing. Simple Java is simple. This statement always troubles us a bit and bears a little explaining. Java is simple in that if you are familiar with almost any other object-oriented programming language, Java s syntax will seem relatively straightforward and easy to learn. Java s syntax is closely aligned with C++ and includes many of the beneficial features found in other programming languages. The off-hand comment by many experienced programmers is that Java is C++ done right. For example, Java is statically typed. This allows the compiler to catch many coding errors. Also, memory and garbage collection are handled by the Java virtual machine. This capability is usually music to the ears of anyone who has spent many a late night trying to find a memory leak in a C++ or C program. These features of course come at a price, which includes the cost of running the application inside of a virtual machine. What is not so simple about Java are the nuances of object-oriented development, the multitude of pre-built Java classes that are available with even the most basic of Java environments, understanding the features and aspects of Java that make it perform well or poorly, and many other aspects of Java that make mastering it more of a lengthy project. So, take the claims of simplicity with a grain of salt and base them on your own personal background and experience.
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