file

Java write/save FAQ: Can you share an example of how to write to a file in Java?

Sure. Here are two "Java file save" or "Java file write" examples, taken from my Java file utilities article (Java file utilities to write, save, open, read, and copy files). I'm not going to explain these too much, but if you need a simple method to write to a file in your Java programs, I hope these methods will help you.

Java file reading FAQ: Can you share some off-the-shelf Java methods I can use to open and read files in Java?

Sure. Taken directly from my Java file utilities article (Java file utilities to open, read, write, and copy files), here is the source code for two Java methods that let you read a text file.

Perl read file FAQ: How can I read a file into an array in Perl (Or, Can you share a Perl read file into array example?)

One of the really cool things about Perl is that it's super-easy to read a file into a Perl array. This is really handy any time you need to read a file for any reason.

A Perl read file into array example

If you want to read a file into a Perl array, you actually only need one line of code, like this:

Java file and directory FAQ: How do I get a list of all files in a directory that match a certain filename pattern?

For a recent Java project I needed to be able to get a list of files within a directory that matched a specific filename pattern. In this case, I needed a list of all files in a directory that began with the underscore character (_). This is relatively easy in Java; as usual it's just hard to find a good example.

Perl file exists FAQ: How can I perform a test to see if a file exists with Perl?

You can test to see if a file exists with the Perl "-e" file operator.

A Perl file exists example

Here's a short Perl "file exists" test/example: