Accessing Files and Directories - Beginning Java - page 436

import static java.nio.file.FileVisitResult.*; // Import constants

import java.nio.file.*;
import java.nio.file.attribute.*;
import java.io.IOException;

public class ListFiles extends SimpleFileVisitor<Path> {
// Output the directory path and set indent for entries
@Override
public FileVisitResult preVisitDirectory(
Path dir,

BasicFileAttributes attr) {
System.out.format("\n%sDirectory: %s contains:", indent, dir);
indent.append(" ");
return CONTINUE;

}

// Note error after walking directory and reset indent
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException

e) {

if(e != null) {
System.out.format(
"\n%sError walking directory: %s\n%s", indent,

dir, e);
}
int len = indent.length();
indent.delete(len-2, len);
return CONTINUE;

}

// Record file or symbolic link details
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes
attr) {
if(attr.isRegularFile()) {
System.out.format("\n%sFile: %s", indent, file);
} else if (attr.isSymbolicLink()) {
System.out.format("\n%sSymbolic link: %s", indent, file);

}
return CONTINUE;

}

// Record file visit failure
@Override
public FileVisitResult visitFileFailed(Path file, IOException e) {
System.err.format("\n%sFile attributes could not be read for:
%s\n%s",

indent,