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Trail: Essential Java Classes
Lesson: Reading and Writing (but no 'rithmetic)

## And the Rest . . .

> In addition to the classes and interfaces discussed in this lesson, `java.io` contains the following classes and interfaces:
> `File`
>   Represents a file on the native file system. You can create a `File` object for a file on the native file system and then query the object for information about that file (such as its full pathname).
> `FileDescriptor`
>   Represents a file handle (or descriptor) to an open file or an open socket. You will not typically use this class.
> `StreamTokenizer`
>   Breaks the contents of a stream into tokens. Tokens are the smallest unit recognized by a text-parsing algorithm (such as words, symbols, and so on). A `StreamTokenizer` object can be used to parse any text file. For example, you could use it to parse a Java source file into variable names, operators, and so on, or to parse an HTML file into HTML tags.
> `FilenameFilter`
>   Used by the list method in the `File` class to determine which files in a directory to list. The `FilenameFilter` accepts or rejects files based on their names. You could use `FilenameFilter` to implement simple regular expression style file search patterns such as `foo*`.
> You also can find some other input and output streams in the `java.util.zip` package, including these:
> `CheckedInputStream` and `CheckedOutputStream`
>   An input and output stream pair that maintains a checksum as the data is being read or written.
> `DeflaterOutputStream`and `InflaterInputStream`
>   Compresses or uncompresses the data as it is being read or written.
> `GZIPInputStream` and `GZIPOutputStream`
>   Reads and writes compressed data in the GZIP format.
> `ZipInputStream` and `ZipOutputStream`
>   Reads and writes compressed data in the ZIP format.

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