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Is NIO the Future of I/O Handling
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The NIO APIs offer an exciting new way to think about and handle some types of file operations Because of this, it is natural to ask the question, Is NIO the future of I/O handling Certainly, channels and buffers offer a clean way of thinking about I/O However, they also add another layer of abstraction Furthermore, the traditional stream-based approach is both well-understood and widely used As explained at the outset, channel-based I/O is currently designed to supplement, not replace, the standard I/O mechanisms defined in javaio In this role, the channel/buffer approach used by the NIO APIs succeeds admirably Whether the new approach will someday supplant the traditional approach, only time and usage patterns will tell
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The javautilregex package supports regular expression processing As the term is used here, a regular expression is a string of characters that describes a character sequence This general description, called a pattern, can then be used to find matches in other character sequences Regular expressions can specify wildcard characters, sets of characters, and various quantifiers Thus, you can specify a regular expression that represents a general form that can match several different specific character sequences There are two classes that support regular expression processing: Pattern and Matcher These classes work together Use Pattern to define a regular expression Match the pattern against another sequence using Matcher
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The Pattern class defines no constructors Instead, a pattern is created by calling the compile( ) factory method One of its forms is shown here: static Pattern compile(String pattern)
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Here, pattern is the regular expression that you want to use The compile( ) method transforms the string in pattern into a pattern that can be used for pattern matching by the Matcher class It returns a Pattern object that contains the pattern Once you have created a Pattern object, you will use it to create a Matcher This is done by calling the matcher( ) factory method defined by Pattern It is shown here: Matcher matcher(CharSequence str) Here str is the character sequence that the pattern will be matched against This is called the input sequence CharSequence is an interface that defines a read-only set of characters It is implemented by the String class, among others Thus, you can pass a string to matcher( )
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The Matcher class has no constructors Instead, you create a Matcher by calling the matcher( ) factory method defined by Pattern, as just explained Once you have created a Matcher, you will use its methods to perform various pattern matching operations The simplest pattern matching method is matches( ), which simply determines whether the character sequence matches the pattern It is shown here: boolean matches( ) It returns true if the sequence and the pattern match, and false otherwise Understand that the entire sequence must match the pattern, not just a subsequence of it To determine if a subsequence of the input sequence matches the pattern, use find( ) One version is shown here: boolean find( ) It returns true if there is a matching subsequence and false otherwise This method can be called repeatedly, allowing it to find all matching subsequences Each call to find( ) begins where the previous one left off You can obtain a string containing the last matching sequence by calling group( ) One of its forms is shown here: String group( ) The matching string is returned If no match exists, then an IllegalStateException is thrown You can obtain the index within the input sequence of the current match by calling start( ) The index one past the end of the current match is obtained by calling end( ) These methods are shown here: int start( ) int end( ) Both throw IllegalStateException if no match exists You can replace all occurrences of a matching sequence with another sequence by calling replaceAll( ), shown here: String replaceAll(String newStr)
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