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Essential Classes
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Basic I/O
Summary
The
java.io package contains many classes that your programs can use
to read and write data. Most of the classes implement sequential access streams.
The sequential access streams can be divided into two groups:
those that read and write bytes and those that read and write Unicode characters.
Each sequential access stream has a speciality,
such as reading from or writing to a file, filtering data as its read or written,
or serializing an object.
The java.nio.file package provides extensive support for file
and file system I/O.
This is a very comprehensive API, but the key entry points are as follows:
- The
Path class has methods for manipulating a path.
- The
Files class has methods for file operations,
such as moving, copy, deleting, and also methods for retrieving and
setting file attributes.
- The
FileSystem class has a variety of methods for
obtaining information about the file system.
More information on NIO.2 can be found on the
OpenJDK: NIO project website on
java.net. This site includes resources for features provided by NIO.2 that are
beyond the scope of this tutorial,
such as multicasting, asynchronous I/O, and creating your own
file system implementation.
