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File I/O (File (class) (operations (checking (.exists(), .notExists(), …

- - - - .exists()
      - .notExists()
      - .isReadable()
      - .isWrittable()
      - .isExecutable()
      - .isSameFile()
    - - .delete()
      - .deleteIfExists()
    - - .copy()
    - - .move()
    - - .readAttributes()
        
        .creationTime()
        
        .lastAccessTime()
        
        .lastModifiedTime()
        
        .size()
    - - .readAllBytes()
      - .write()
      - .newBufferedReader()
        .newBufferedWriter()
        
        shortcut of I/O Stream
      - .newInputStream()
        .newOutputStream()
        
        shoftcut of I/O Stream
    - - .createFile()
      - .createTempFile()
    - - .createDirectory()
        
        DirectoryStream()
        
        show all files in dir
    - - FileVisitor
        (interface)
      - visitor design pattern
    - - PathMatcher.matchers(filename)
    - - watch directory for changes
  - - - SeekableByteChannel
        (class)
        
        FileChannel
        (class)
    - - used by channels
      - has different types
        for each primitive type
- - - - .getName()
      - .getNameCount()
      - .subPath()
      - .getParent()
      - .getRoot()
      - .getFileName()
    - - FileSystem.getDefault().getPath("/tmp")
      - Paths.get("/tmp")
    - - .toUri()
        
        browsers
      - .toAbsoutPath()
        
        file may not exist
      - .toRealPath()
        
        file must exist
    - - .resolve()
    - - .equals()
      - .startsWith()
      - .compareTo()