Java snippets

Java snippets

• Removes a directory and all of its subdirectories and their files.

  /**

  • Removes a directory and all of its subdirectories and their files.

  • @param path The path of an existing directory. Returns siletly if the path does not exist.

  • @throws IOException If failed to traverse tree (due to permissions, hardware failure, etc.) */ static void removeDir(Path path) throws IOException { if (!path.toFile().exists()) { return; } Files.walkFileTree(path, new SimpleFileVisitor() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { Files.delete(file); return FileVisitResult.CONTINUE; }

     @Override
     public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
         Files.delete(dir);
         return FileVisitResult.CONTINUE;
     }
    

    });

• Refer to subclass in base class

  class A<T extends A> { T foo(); } class B extends A { @Override B foo(); }