Apply String modification to Array/List

Question

Given an ArrayList<String> of filenames with file extension, how can I idiomatically get that same array with all the filenames sans file extension.

There's a lot of ways to do this and I could easily just create a new array but I'm wondering if there's a nice clean way to do this with a one-liner.

For now I am doing like so:

List<String> namesWithExt = ...
List<String> namesWithoutExt = new ArrayList<>();
namesWithExt.forEach(name -> namesWithoutExt.add(FilenameUtils.removeExtension(name)));
String[] namesWithoutExt = namesWithExt.toArray(String[]::new);

Eran · Accepted Answer · 2018-10-22 08:04:24Z

4

Use Streams:

String[] namesWithoutExt = 
    namesWithExt.stream()
                .map(name -> FilenameUtils.removeExtension(name))
                .toArray(String[]::new);

or:

String[] namesWithoutExt = 
    namesWithExt.stream()
                .map(FilenameUtils::removeExtension)
                .toArray(String[]::new);

edited Oct 22, 2018 at 8:04

answered Oct 22, 2018 at 7:35

Eran

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2 Comments

LuCio Over a year ago

Or using a method reference: .map(FilenameUtils::removeExtension)

vaps Over a year ago

This is what I'm looking for - thanks. I'm gonna wait a day before I accept your answer to see if anyone else has something to add as well.

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