More Files Methods

• void delete(Path p) This will delete an empty directory or a regular file sitting at the specified path. A NoSuchFileException is thrown if the path points at a nonexistent item.
• void copy(Path source, Path dest, CopyOption... opts) This will copy a file sitting at source to path dest.
• byte[] readAllBytes(Path p) This will read all of the bytes into a byte array.
• String readString(Path p) This will read a text file into a String.
• List<String> readAllLines(Path p) This will read all of the lines of a file into a list of strings.
• Stream<Path> list(Path p) This provides a stream of paths in p if p is a directory and throws an exception otherwise.

What can you get a Stream from?

• Collection<T>: Any class implementing this interface. Subinterfaces include List<T> and Set<T> and Queue<T>.
• ArrayList<T>
• TreeSet<T>
• HashSet<T>
• Arrays.stream will return a stream of the array's elements.

Also, a BufferedReader has a lines() method that can offer you a Stream<String>. Files.list will give you a stream of a directory's contents.

Filtering Streams

There is an interface Predicate<T>.

java Crawler directory extension

directory: a directory
extension: file extension
Show all files having the extension living in the directory.



Print out all lines in hughJass.txt that contain a specified
string.

SearchHugh.java  


java SearchHugh syzygy

spit result into a file named syzygy.finds