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The Art of Java
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programmer was able to easily add dynamic content to the rather static world of HTML. Java applets made the Web move, and there was no going back. In addition to changing the way that we thought about Web content, the applet had another important effect or perhaps side effect. It helped propel the move to component software. Because applets are small programs, they usually represent small units of functionality, which is the same thing that a software component does. Once we began to think in terms of applets, it was a small step to Beans, and beyond. Today, the component-oriented architecture, in which an application consists of an interacting set of components, has largely replaced the monolithic model that typified the past.
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The Continuing Revolution
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There is one more aspect of Java that reflects its genius, although it isn t actually part of the language. Java brought with it a culture of innovation that welcomed new ideas, and a process by which these new ideas could be rapidly assimilated. Whereas many other computer languages change slowly, Java is constantly evolving and adapting. Furthermore, this process is open to the entire Java community through the Java Community Process (JCP). The JCP offers a mechanism by which users of Java help influence the future direction of the language, tools, and associated technologies. Thus, the people that actually use the language have input into its ongoing development. From the start, Java revolutionized programming and the revolution hasn t stopped. Java is still at the forefront of computer language development. It is a language that has earned a lasting place in the history of computing.
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CHAPTER
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A Recursive-Descent Expression Parser
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by Herb Schildt
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The Art of Java
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ow do you write a program that will take as input a string containing a numeric expression, such as (10 5) * 3, and compute the proper answer If there is still a high priesthood among programmers, it must be those few who know how to do this. Many otherwise accomplished programmers are mystified by the way a high-level language converts algebraic expressions into instructions that a computer can execute. This procedure is called expression parsing, and it is the backbone of all language compilers and interpreters, spreadsheets, and anything else that needs to convert numeric expressions into a form that the computer can use. Although mysterious to the uninitiated, expression parsing is a well-defined task for which there is a rather elegant solution. This is because the problem is well defined and expression parsing works according to the strict rules of algebra. This chapter develops what is commonly referred to as a recursive-descent parser and all the necessary support routines that enable you to evaluate numeric expressions. Once you have mastered the operation of the parser, you can easily enhance and modify it to suit your needs. Aside from being a useful piece of code in itself, the parser was chosen as the first example in this book because it illustrates the power and range of the Java language. A parser is a pure code subsystem. By this, I mean that it is not network-oriented, does not rely on a GUI interface, is neither an applet nor servlet, and so on. It is the type of code that one might expect to find written in C or C++, but not Java. Because Java was a revolutionary force that fundamentally changed the way we program for the Internet, we sometimes forget that it is not limited to that environment. Instead, Java is a full-featured language that can be applied to nearly any programming task. The parser developed in this chapter proves this point.
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Expressions
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Because the parser processes an expression, it is necessary to understand what constitutes an expression. Although there are many different types of expressions, this chapter deals with only one type: numeric expressions. For our purposes numeric expressions are composed of the following items: Numbers The operators +, , /, *, ^, %, = Parentheses Variables Here, the operator ^ indicates exponentiation (not the XOR as it does in Java) and = is the assignment operator. These items can be combined in expressions according to the rules of algebra. Here are some examples: 10 8 (100 5) * 14/6 a+b c 10^5 a = 10 b
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