Java tutorial
//package com.java2s; import java.io.File; import java.util.Arrays; import java.util.Comparator; import java.util.List; public class Main { public static void sortFileByDate(List<File> allFileList) { File[] files = new File[allFileList.size()]; for (int i = 0; i < allFileList.size(); i++) { files[i] = allFileList.get(i); } Arrays.sort(files, new Comparator<File>() { public int compare(File f1, File f2) { return Long.valueOf(f1.lastModified()).compareTo(f2.lastModified()); } }); allFileList.clear(); allFileList.addAll(Arrays.asList(files)); } }