Java NIO.2 —— 文件或目录删除操作

import java.io.IOException;
 import java.nio.file.FileVisitOption;
 import java.nio.file.FileVisitResult;
 import java.nio.file.FileVisitor;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.EnumSet;
 
class DeleteDirectory implements FileVisitor {    
 
 boolean deleteFileByFile(Path file) throws IOException {
     return Files.deleteIfExists(file);
  }
 
 @Override
  public FileVisitResult postVisitDirectory(Object dir, IOException exc) 
                                                                  throws IOException {
 
    if (exc == null) {
         System.out.println("Visited: " + (Path) dir);
         boolean success = deleteFileByFile((Path) dir);
 
        if (success) {
              System.out.println("Deleted: " + (Path) dir);
         } else {
               System.out.println("Not deleted: " + (Path) dir);
         }
     } else {
         throw exc;
     }
     return FileVisitResult.CONTINUE;
  }
 
 @Override
  public FileVisitResult preVisitDirectory(Object dir, BasicFileAttributes attrs) 
                                                                  throws IOException {
    return FileVisitResult.CONTINUE; 
 }
 
 @Override
  public FileVisitResult visitFile(Object file, BasicFileAttributes attrs) 
                                                                  throws IOException {
    boolean success = deleteFileByFile((Path) file);
 
   if (success) {
         System.out.println("Deleted: " + (Path) file);
    } else {
         System.out.println("Not deleted: " + (Path) file);
    }
 
   return FileVisitResult.CONTINUE;
  }
 
 @Override
  public FileVisitResult visitFileFailed(Object file, IOException exc) 
                                                                  throws IOException {
    //report an error if necessary
 
   return FileVisitResult.CONTINUE;
  }
 }
 
class Main {
 
 public static void main(String[] args) throws IOException {
 
   Path directory = Paths.get("C:/rafaelnadal");
    DeleteDirectory walk = new DeleteDirectory();
    EnumSet opts = EnumSet.of(FileVisitOption.FOLLOW_LINKS);
 
   Files.walkFileTree(directory, opts, Integer.MAX_VALUE, walk);       
   }
 }