Java 8, Convert file name array to file array

Question

I have an array of String file names and I want to convert them into File array. I am wandering whether there is a more elegant way of doing it rather than this one.

String[] names = {file1, file2, file3};
File[] files = new String[names.length];
for (int i = 0; i < names.length; i++) {
   files[i] = new File(names[i]);
}

EDIT Thanks for noting in comments. I am using Java 8

Side note: Consider to use Path from the NIO.2 File API instead of File objects. — Puce
– Puce, Commented Sep 2, 2015 at 15:05

Luiggi Mendoza · Accepted Answer · 2015-09-02 14:48:24Z

9

In Java 7 or less, using plain JDK, there's not. Since Java 8, you may use streams for this:

String[] names = {file1, file2, file3};
File[] files = Arrays.stream(names)
    .map(s -> new File(s))
    .toArray(size -> new File[names.length]);

answered Sep 2, 2015 at 14:48

Luiggi Mendoza

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4 Comments

bcsb1001 Over a year ago

s -> new File(s) can be simplified to File::new. Personally, I prefer method references.

Luiggi Mendoza Over a year ago

@bcsb1001 careful when using that approach, specially for overloaded methods. After some reading and facing issues using Class::method when method is overloaded (even class constructors), I prefer to use the descriptive way.

Puce Over a year ago

You can also use .toArray(File[]::new), but again: consider Path instead of File and possibly List instead of array.

Luiggi Mendoza Over a year ago

@Puce I'm aware of that, but OP asked about using File and arrays. Just providing what he asked.

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