c# barcode generator library open source Prerequisites in Font

Create Data Matrix 2d barcode in Font Prerequisites

Prerequisites
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You should have the Java JDK 1.5 or higher installed on your machine as well as Scala 2.7.3 or higher.
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Downloading the Code
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The source code for this book is available to readers at www.apress.com in the Source Code section of this book s home page. Please feel free to visit the Apress web site and download all the code there. You can also check for errata and find related titles from Apress.
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Contacting the Author
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David blogs Scala at http://scala-blogs.org and rants about things on his personal blog at http://blog.lostlake.org. But David can most often be found on the Lift user group, http://groups.google.com/group/liftweb/.
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About Scala and How to Install It
GS1 DataBar Expanded Creation In Visual Studio .NET
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Make Barcode In Visual C#
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cala is a programming language that provides a best-of-all-worlds experience for developers. Java programmers will find that their libraries are fully interoperable with Scala code.1 Dynamic-language users will find Scala s concise syntax and type inferencing a way to reduce the boilerplate needed when writing programs in Java and C#. Functional programmers will find Scala s powerful type system a great way to reason about code. Scala bridges a lot of the divides in programming languages. In this chapter, I ll discuss my journey learning Scala as well as where Scala comes from, how to install it, and the Scala community.
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Scala: A Great Language for the Java Virtual Machine
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I ve been writing computer programs for a long time. I ve written commercial code in 6502 assembler, BASIC, Pascal, C, C++, Objective-C, Java, C#, Visual Basic, Smalltalk, Ruby, JavaScript, and Scala. Over the years, I ve had a couple of Oh my! reactions to computer languages. In 1996, when I first found Java, it was a revelation. I no longer had to worry about freeing memory, and Java had a sane and normal exception-handling mechanism. Overnight, 70 percent of the defects in my programs went away. For many years, I used and loved Java.
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1. Scala can call any Java code, subclass any Java class, and implement any Java interface. Java code can call into Scala code if the Scala code subclasses a Java class or implements a Java interface. There are features of Scala that cannot be accessed from Java, including traits with defined methods, classes and methods that have names illegal in Java, and Scala s advanced types. 1
CHAPTER 1 ABOUT SCALA AND HOW TO INSTALL IT
In the Java 1.0 and 1.1 days, the Java Virtual Machine (JVM) was slow, and garbage collection was a costly operation. Over the years, the JVM matured. The JVM s overall performance improved with HotSpot, and by JDK 1.3, Java application code was as fast as C++ application code. Java programs could run for weeks, months, and in some cases, years without restarting.2
NOTE While there is a lot of discussion of this issue, my experience is that well-tuned Java code runs as
fast or faster than well-tuned C and C++ code. Integer, a pure Java spreadsheet that I wrote, performed as well as Excel in Sun benchmarks on a single-processor machine. Integer outperformed Excel by significant margins on symmetric multiprocessing (SMP) machines. Sam Pullara benchmarked Java s String classes against Objective-C s NSString classes and found that Java outperformed native code by a wide margin. See http://www.theserverside.com/news/thread.tss thread_id=25743 (the original citation is gone). I agree that a hyper-tuned C or C++ program can outperform a Java program and that Java programs require 100 percent more RAM to perform as well as their C or C++ counterparts, but for any moderately complex project that is not at the operating system kernel level, a JVM program will outperform a C or C++ program.
Over the years, Java, the language, failed to mature. Java stagnated in syntax, and web frameworks built on Java became increasingly top-heavy. It took more and more lines of Java, XML, and other pieces of glue to express simple concepts such as fields and to generate HTML forms from those fields. I used Java on most projects but became increasingly disillusioned with it. Java 5 brought enumerations and generics. I found these to be welcome additions at the conceptual level, but at the coding level I could no longer use a simple text editor to write Java; I had to use an IDE (integrated development environment). The nasty declaration syntax for HashMap<String, ArrayList<Integer>> = new HashMap<String, ArrayList<Integer>>(); meant that I really needed a tool that did code completion in order to write the simplest of programs.
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