The java.io package contains nearly every class you might ever need to perform
input and output (I/O)in Java.
All these streams represent an input source and an output destination.
The stream in the java.io package supports many data such as primitives,
Object, localized characters, etc.
A stream can be defined as a sequence of data.
The InputStream is used to read data from a source and the
OutputStream is used for writing data to a destination.
Java provides strong but flexible support for I/O related to Files and networks.
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