File Lambda expression in Java 7

Question

The below code works fine in Java 8.

files.addAll(Arrays.asList(folder.listFiles((f) -> f.getName()
                .endsWith(CustomConstantsRepository.FILE_EXT_DAT)
                && f.getName().startsWith(fileName))));

I need the same functionality to work in Java 7.

Thanks in advance.

See, essentially [Read all files in a folder](https://stackoverflow.com/a/1846349) and then add validation in the else for the name for the suffix and beginning. — KevinO, May 23 '17 at 03:54
Try this [third party](https://github.com/orfjackal/retrolambda) it is awesome. — Fady Saad, May 23 '17 at 03:54
I'm voting to close this question as off-topic because "gimme teh codez" — EJoshuaS - Stand with Ukraine, May 23 '17 at 04:07

d_scalzi · Accepted Answer · 2017-05-28T08:30:06.013

You would use an Anonymous Inner Class, as Java 8 lambda expressions are essentially syntatical sugar which do nearly the same thing. That would look something like this.

files.addAll(Arrays.asList(folder.listFiles(new FileFilter(){

        @Override
        public boolean accept(File f) {
            return f.getName().endsWith(CustomConstantsRepository.FILE_EXT_DAT) && f.getName().startsWith(fileName)));
        }

})));

File Lambda expression in Java 7

1 Answers1