java barcode reader open source Also, because File now supports the Comparable interface, the method compareTo( ) is also supported in Java

Generation Denso QR Bar Code in Java Also, because File now supports the Comparable interface, the method compareTo( ) is also supported

Also, because File now supports the Comparable interface, the method compareTo( ) is also supported
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A directory is a File that contains a list of other files and directories When you create a File object and it is a directory, the isDirectory( ) method will return true In this case, you can call list( ) on that object to extract the list of other files and directories inside It has two forms The first is shown here: String[ ] list( ) The list of files is returned in an array of String objects The program shown here illustrates how to use list( ) to examine the contents of a directory:
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// Using directories import javaioFile; class DirList { public static void main(String args[]) { String dirname = "/java"; File f1 = new File(dirname); if (f1isDirectory()) { Systemoutprintln("Directory of " + dirname); String s[] = f1list(); for (int i=0; i < slength; i++) { File f = new File(dirname + "/" + s[i]); if (fisDirectory()) { Systemoutprintln(s[i] + " is a directory"); } else { Systemoutprintln(s[i] + " is a file");
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} } else { Systemoutprintln(dirname + " is not a directory"); }
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Here is sample output from the program (Of course, the output you see will be different, based on what is in your directory) Directory of /java bin is a directory lib is a directory demo is a directory COPYRIGHT is a file README is a file indexhtml is a file include is a directory srczip is a file hotjava is a directory src is a directory
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You will often want to limit the number of files returned by the list( ) method to include only those files that match a certain filename pattern, or filter To do this, you must use a second form of list( ), shown here: String[ ] list(FilenameFilter FFObj) In this form, FFObj is an object of a class that implements the FilenameFilter interface FilenameFilter defines only a single method, accept( ), which is called once for each file in a list Its general form is given here: boolean accept(File directory, String filename) The accept( ) method returns true for files in the directory specified by directory that should be included in the list (that is, those that match the filename argument), and
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returns false for those files that should be excluded The OnlyExt class, shown next, implements FilenameFilter It will be used to modify the preceding program so that it restricts the visibility of the filenames returned by list( ) to files with names that end in the file extension specified when the object is constructed import javaio*; public class OnlyExt implements FilenameFilter { String ext; public OnlyExt(String ext) { thisext = "" + ext; } public boolean accept(File dir, String name) { return nameendsWith(ext); }
The modified directory listing program is shown here Now it will only display files that use the html extension // Directory of HTML files import javaio*; class DirListOnly { public static void main(String args[]) { String dirname = "/java"; File f1 = new File(dirname); FilenameFilter only = new OnlyExt("html"); String s[] = f1list(only); for (int i=0; i < slength; i++) { Systemoutprintln(s[i]); }
The listFiles( ) Alternative
Java 2 adds a variation to the list( ) method, called listFiles( ), which you might find useful The signatures for listFiles( ) are shown here: File[ ] listFiles( ) File[ ] listFiles(FilenameFilter FFObj) File[ ] listFiles(FileFilter FObj) These methods return the file list as an array of File objects instead of strings The first method returns all files, and the second returns those files that satisfy the specified FilenameFilter Aside from returning an array of File objects, these two versions of listFiles( ) work like their equivalent list( ) methods The third version of listFiles( ) returns those files with path names that satisfy the specified FileFilter FileFilter defines only a single method, accept( ), which is called once for each file in a list Its general form is given here: boolean accept(File path) The accept( ) method returns true for files that should be included in the list (that is, those that match the path argument), and false for those that should be excluded
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