java.io
package. (There are also a few more in the sun.io
and sun.net
packages, but those are deliberately hidden from you. There are also a couple in java.util.zip
.) Dividing the hierarchy in CharacterStream and ByteStream
java.io
. Reader and java.io
. Writer
are two main classes.java.io.InputStream
and java.io.OutputStream
. CharacterStream
Reader
and Writer
are the abstract superclasses for character streams in java.io
. Reader
provides the API and partial implementation for readers--streams that read 16-bit characters--and Writer
provides the API and partial implementation for writers--streams that write 16-bit characters. Reader
and Writer
implement specialized streams and are divided into two categories: those that read from or write to data sinks (shown in gray in the following figures) and those that perform some sort of processing (shown in white). The figure shows the class hierarchies for the Reader
and Writer
classes. Most programs should use readers and writers to read and write information. This is because they both can handle any character in the Unicode character set (while the byte streams are limited to ISO-Latin-1 8-bit bytes).
Byte Stream
Programs should use the byte streams, descendants of InputStream
and OutputStream
, to read and write 8-bit bytes. InputStream
and OutputStream
provide the API and some implementation for input streams (streams that read 8-bit bytes) and output streams (streams that write 8-bit bytes). These streams are typically used to read and write binary data such as images and sounds.
As with Reader
and Writer
, subclasses of InputStream
and OutputStream
provide specialized I/O that falls into two categories: data sink streams and processing streams.
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