How can I sort files in a directory in java?

Question

Here is my code and it works ! But I want to be able to sort the files list according to name, size, modification date and more

import java.io.File;
import o         


        

Answer 1

Arrays.sort( files, new Comparator() {
    public int compare( File a, File b ) {
        // do your comparison here returning -1 if a is before b, 0 if same, 1 if a is after b
    }
} );

You could define a bunch of different Comparator classes to do different comparisons like such:

public class FileNameComparator implements Comparator {
    public int compare( File a, File b ) {
        return a.getName().compareTo( b.getName() );
    }
}

public class FileSizeComparator implements Comparator {
    public int compare( File a, File b ) {
        int aSize = a.getSize();
        int bSize = b.getSize();
        if ( aSize == bSize ) {
            return 0;
        }
        else {
            return Integer.compare(aSize, bSize);
        }
    }
}

...

Then you would just swap em out:

Arrays.sort( files, new FileNameComparator() );

or

Arrays.sort( files, new FileSizeComparator() );