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/**
* Returns an array of abstract pathnames denoting the files and
* directories in the directory denoted by this abstract pathname that
* satisfy the specified filter. The behavior of this method is the same
* as that of the {@link #listFiles()} method, except that the pathnames in
* the returned array must satisfy the filter. If the given {@code filter}
* is {@code null} then all pathnames are accepted. Otherwise, a pathname
* satisfies the filter if and only if the value {@code true} results when
* the {@link FilenameFilter#accept
* FilenameFilter.accept(File, String)} method of the filter is
* invoked on this abstract pathname and the name of a file or directory in
* the directory that it denotes.
*
* @param filter
* A filename filter
*
* @return An array of abstract pathnames denoting the files and
* directories in the directory denoted by this abstract pathname.
* The array will be empty if the directory is empty. Returns
* {@code null} if this abstract pathname does not denote a
* directory, or if an I/O error occurs.
*
* @throws SecurityException
* If a security manager exists and its {@link
* SecurityManager#checkRead(String)} method denies read access to
* the directory
*
* @since 1.2
* @see java.nio.file.Files#newDirectoryStream(Path,String)
*/
public File[] listFiles(FilenameFilter filter) {
String ss[] = list();
if (ss == null) return null;
ArrayList<File> files = new ArrayList<>();
for (String s : ss)
if ((filter == null) || filter.accept(this, s))
files.add(new File(s, this));
return files.toArray(new File[files.size()]);
} |
