Java - get the newest file in a directory?

Question

Does anybody have a snippet of Java that can return the newest file in a directory (or knowledge of a library that simplifies this sort of thing)?

Answer 1

private File getLatestFilefromDir(String dirPath){
    File dir = new File(dirPath);
    File[] files = dir.listFiles();
    if (files == null || files.length == 0) {
        return null;
    }

    File lastModifiedFile = files[0];
    for (int i = 1; i < files.length; i++) {
       if (lastModifiedFile.lastModified() < files[i].lastModified()) {
           lastModifiedFile = files[i];
       }
    }
    return lastModifiedFile;
}

Answer 2

Something like:

import java.io.File;
import java.util.Arrays;
import java.util.Comparator;


public class Newest {
    public static void main(String[] args) {
        File dir = new File("C:\\your\\dir");
        File [] files  = dir.listFiles();
        Arrays.sort(files, new Comparator(){
            public int compare(Object o1, Object o2) {
                return compare( (File)o1, (File)o2);
            }
            private int compare( File f1, File f2){
                long result = f2.lastModified() - f1.lastModified();
                if( result > 0 ){
                    return 1;
                } else if( result < 0 ){
                    return -1;
                } else {
                    return 0;
                }
            }
        });
        System.out.println( Arrays.asList(files ));
    }
}

Answer 3

This will return the most recent created file, I made this because when you create a file in some situations, it may not always have the correct modified date.

import java.nio.file.Files;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;

private File lastFileCreated(String dir) {
    File fl = new File(dir);
    File[] files = fl.listFiles(new FileFilter() {
        public boolean accept(File file) {
            return true;
        }
    });

    FileTime lastCreated = null;
    File choice = null;

    for (File file : files) {
        BasicFileAttributes attr=null;
        try {
            attr = Files.readAttributes(file.toPath(), BasicFileAttributes.class);
        }catch (Exception e){
            System.out.println(e);
        }

        if(lastCreated ==null)
            lastCreated = attr.creationTime();

        if (attr!=null&&attr.creationTime().compareTo(lastCreated)==0) {
            choice = file;
        }
    }
    return choice;
}