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PRINT X; Y; X*Y NEXT NEXT
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The following program exercises all of the relational operators:
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PRINT "This demonstrates all of the relational operators." A = 10 B = 20 IF A = B THEN PRINT "A = B" IF A <> B THEN PRINT "A <> B" IF A < B THEN PRINT "A < B" IF A > B THEN PRINT "A > B" IF A >= B THEN PRINT "A >= B" IF A <= B THEN PRINT "A <= B"
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It is quite easy to add statements to the Small BASIC interpreter. Just follow the general format taken by the statements presented in the chapter. To add different variable types, you will need to create a class that stores the type and the value of the variable, and then use an array of these objects to store the variables.
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While enhancing or expanding Small BASIC is a good way to become more familiar with its operation and with the way language interpreters work, you are not limited to the BASIC language. You can use the same techniques described in this chapter to write an interpreter for just about any computer language, including a simplified subset of Java. You can even invent your own language that reflects your own programming style and personality. In fact, the interpreter skeleton used by Small BASIC is a perfect test bench for any type of special language feature you might want to experiment with. For example, to add a REPEAT/UNTIL loop to the interpreter, you need to follow these steps:
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1. Add REPEAT and UNTIL as keywords and define integer values for them. 2. Add REPEAT and UNTIL to the main loop switch statement. 3. Define repeat( ) and until( ) methods that process the REPEAT and UNTIL
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statements. (Use execFor( ) and next( ) as starting points.) For those readers who enjoy a challenge, try creating a script language that automates various computing tasks, such as copying or erasing files, compiling a program, and so on. Then create an interpreter for that language. Such a language could provide an alternative to using standard batch files. In essence, you could adapt the interpreter to support your own proprietary batch processing scheme.
CHAPTER
Creating a Download Manager in Java
by James Holmes
The Art of Java
ave you ever had an Internet download interrupted before its completion, just to put you back at square one If you connect to the Internet with a dialup connection, it s very likely that you ve run into this all too common nuisance. Everything from call waiting disconnects to computer crashes can leave a download dead in its tracks. To say the least, restarting a download from scratch over and over can be a very time-consuming and frustrating experience. A little-known fact is that many interrupted downloads can be resumed. This allows you to recommence downloading from the point at which a download terminates instead of having to begin anew. However, most of today s Internet browsers either don t make this feature readily available or make it overly cumbersome to use. Enter the Download Manager: a tool that manages Internet downloads for you and makes simple work of resuming interrupted downloads. At the core of the Download Manager s usefulness is its ability to take advantage of downloading only specific portions of a file. In a classic download scenario, a whole file is downloaded from beginning to end. If the transmission of the file is interrupted for any reason, the progress made toward completing the downloading of the file is lost. On the contrary, the Download Manager can pick up from where an interruption occurs and then download only the file s remaining fragment. Not all downloads are created equal, though, and there are some that simply cannot be resurrected. Details on which files are and aren t resumable are explained in the following section. Not only is the Download Manager a useful utility, it is an excellent illustration of the power and succinctness of Java s built-in APIs especially as they apply to interfacing to the Internet. The previous two chapters showed the fundamental elegance of the Java language; this and the following three chapters demonstrate the ease with which Java programs can access the Internet. Because the Internet was a driving force behind the creation of Java, it should come as no surprise that Java s networking capabilities are unsurpassed. For example, attempting to create the Download Manager in another language, such as C++, would entail significantly more trouble and effort. Of course, that is the art of Java!
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