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Whenever you create FileInputStream instances, you must also tell
Java what to do in the event that a lamentable input–output error occurs:
for example, your program might try to attach a file input stream to a file that
does not exist.
In such lamentable situations, Java is said to throw an exception. For example, Java throws an exception
that is an instance of the FileNotFoundException class whenever
you try to connect a file input stream to a file that does not exist.