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This example creates a Vector and then adds two filenames to it It passes that vector of names to the InputStreamEnumerator class, which is designed to provide a wrapper on the vector where the elements returned are not the filenames but rather, open FileInputStreams on those names The SequenceInputStream opens each file in turn, and this example prints the contents of the two files
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The PrintStream class provides all of the output capabilities we have been using from the System file handle, Systemout, since the beginning of the book This makes PrintStream one of Java s most often used classes It implements the Appendable, Closeable, and Flushable interfaces PrintStream defines several constructors The ones shown next have been specified from the start: PrintStream(OutputStream outputStream) PrintStream(OutputStream outputStream, boolean flushOnNewline) PrintStream(OutputStream outputStream, boolean flushOnNewline, String charSet) Here, outputStream specifies an open OutputStream that will receive output The flushOnNewline parameter controls whether the output buffer is automatically flushed every time a newline (\n) character or a byte array is written, or when println( ) is called If flushOnNewline is true, flushing automatically takes place If it is false, flushing is not automatic The first constructor does not automatically flush You can specify a character encoding by passing its name in charSet The next set of constructors give you an easy way to construct a PrintStream that writes its output to a file PrintStream(File outputFile) throws FileNotFoundException PrintStream(File outputFile, String charSet) throws FileNotFoundException, UnsupportedEncodingException PrintStream(String outputFileName) throws FileNotFoundException PrintStream(String outputFileName, String charSet) throws FileNotFoundException, UnsupportedEncodingException These allow a PrintStream to be created from a File object or by specifying the name of a file In either case, the file is automatically created Any preexisting file by the same name is destroyed Once created, the PrintStream object directs all output to the specified file You can specify a character encoding by passing its name in charSet PrintStream supports the print( ) and println( ) methods for all types, including Object If an argument is not a primitive type, the PrintStream methods will call the object s toString( ) method and then display the result
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19:
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Recently (with the release of JDK 5), the printf( ) method was added to PrintStream It allows you to specify the precise format of the data to be written The printf( ) method uses the Formatter class (described in 18) to format data It then writes this data to the invoking stream Although formatting can be done manually, by using Formatter directly, printf( ) streamlines the process It also parallels the C/C++ printf( ) function, which makes it easy to convert existing C/C++ code into Java Frankly, printf( ) is a much welcome addition to the Java API because it greatly simplifies the output of formatted data to the console The printf( ) method has the following general forms: PrintStream printf(String fmtString, Object args) PrintStream printf(Locale loc, String fmtString, Object args) The first version writes args to standard output in the format specified by fmtString, using the default locale The second lets you specify a locale Both return the invoking PrintStream In general, printf( ) works in a manner similar to the format( ) method specified by Formatter The fmtString consists of two types of items The first type is composed of characters that are simply copied to the output buffer The second type contains format specifiers that define the way the subsequent arguments, specified by args, are displayed For complete information on formatting output, including a description of the format specifiers, see the Formatter class in 18 Because Systemout is a PrintStream, you can call printf( ) on Systemout Thus, printf( ) can be used in place of println( ) when writing to the console whenever formatted output is desired For example, the following program uses printf( ) to output numeric values in various formats In the past, such formatting required a bit of work With the addition of printf( ), this now becomes an easy task
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// Demonstrate printf() class PrintfDemo { public static void main(String args[]) { Systemoutprintln("Here are some numeric values " + "in different formats\n"); Systemoutprintf("Various integer formats: "); Systemoutprintf("%d %(d %+d %05d\n", 3, -3, 3, 3); Systemoutprintln(); Systemoutprintf("Default floating-point format: %f\n", 1234567123); Systemoutprintf("Floating-point with commas: %,f\n", 1234567123); Systemoutprintf("Negative floating-point default: %,f\n", -1234567123); Systemoutprintf("Negative floating-point option: %,(f\n", -1234567123); Systemoutprintln(); Systemoutprintf("Line up positive and negative values:\n"); Systemoutprintf("% ,2f\n% ,2f\n",
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