getting the last file between files with java program

Question

How do I find the last modified file in a directory with java? get file name of last file modified java EXP: i have: test_4755_err.log. test_4588_err.log. test_14587_err.log.` i wanna get thé last file between this files

Answer 1

Are you just looking for the file that was last modified? You could do:

File lastModified = null;
String directory = "."; // replace with your directory
File[] files = new File(directory).listFiles();
if(files != null){
    Arrays.sort(files, new Comparator<File>(){
        @Override
        public int compare(File o, File t){
            // reverse the ordering so the newest file is first in the array
            return -1 * Long.compare(o.lastModified(), t.lastModified());
        }
    });
    lastModified = files[0];
}

As pointed out, this would be more efficient:

File newest = null
for(File f : new File(dir).listFiles()){
    if(newest == null || f.lastModified() > newest.lastModified()){
        newest = f;
    }
}