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The javautilScanner Class
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A scanner reads characters from a source and converts them into tokens The source is usually a text-based input stream containing formatted data The formatted values in the source are separated by delimiters, usually whitespace A token is a sequence of characters in the source that comprises a formatted value A scanner generally uses regular expressions to recognize tokens in the source input A point to note is that a scanner can also use regular expressions to recognize delimiters, which are normally discarded Such a scanner is also called a tokenizer (also called a lexical analyzer), and the process is called tokenization Some scanners also convert the tokens into values of appropriate types for further processing Scanners with this additional functionality are usually called parsers The class Scanner in the javautil package provides powerful tools to implement text scanners which use regular expressions to tokenize and parse formatted data into primitive types and strings The Patternsplit() method (and the Stringsplit() method that uses this method) also provide tokenizing capabilities (p 563), but these are not as versatile as the Scanner class
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CHAPTER 12: LOCALIZATION, PATTERN MATCHING, AND FORMATTING
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We will discuss two modes of operation for a scanner: Tokenizing Mode, for tokenizing a stream of formatted data values Multi-Line Mode, for searching or finding matches in line-oriented input
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Basics of Tokenizing
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Tokenizing is analogous to successive matching (p 567), involving reading of the characters in the source, and recognizing tokens in the source Example 1210 shows a bare-bones tokenizer that tokenizes a string, but it embodies the paradigm for constructing more sophisticated scanners The rest of the subsection will present variations on this tokenizer 1 The source for the input to the scanner must be identified The example shows a String as the source, but we can also use other sources, such as a File, an InputStream or a BufferedReader A scanner is created and associated with the source that is passed as argument in the constructor call The Scanner class provides constructors for various kinds of sources The bulk of the work of a scanner is done in a lookahead-and-parse loop The condition of the loop is a call to a lookahead method to see if an appropriate token can be identified in the remaining source The Scanner class provides lookahead methods named hasNextType to determine whether the next token in the source is of the appropriate primitive Type Note that the scanner reads the characters from the source sequentially The call to the hasNext() method at (3) returns true if there is a (String) token in the source The loop terminates when the hasNext() method returns false, meaning that the source string has been exhausted, ie, there are no more tokens Each successive call to a lookahead method causes the scanner to advance and look for the next token in the source 4 If a lookahead method determines that there is a token in the source, the token can be parsed in the loop body The Scanner class provides parse methods named nextType to parse the next token in the source to the appropriate primitive type The call to the next() method at (4) parses the next token to a String In the example, the parsed value is printed, but it can be stored and used as desired Also in the example, the scanner uses the default delimiters (whitespace) to tokenize the string A lookahead method and its corresponding parse method are used in lockstep to ensure that characters in the source are matched and parsed to a token of an appropriate type 5 A scanner whose source has been explicitly associated in the code, should be closed when it is no longer needed This also closes the source, if that is necessary
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