Create a temporary file in Java

Sometimes it comes in handy to create a temporary file.
Here we create a temporary file with the prefix “temp_” as shown by the first parameter.
The second parameter is an optional suffix, if it’s null as in the example, .tmp will be
used by default.
Optionally a third parameter can be defined pointing out the directory in which the file will
be created. If not specified (as below), the default temporary directory will be used.

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