使用递归：     import java.io.File;      import java.util.ArrayList;      public class FileSystem1 {          private static ArrayList filelist = new ArrayList();           public static void main(String[] args) {              long a = System.currentTimeMillis();              refreshFileList("C:/Users/shibin/Desktop/tupian");              System.out.println(System.currentTimeMillis() - a);          }          public static void refreshFileList(String strPath) {               File dir = new File(strPath);               File[] files = dir.listFiles();               if (files == null)                   return;               for (int i = 0; i < files.length; i++) {                   if (files[i].isDirectory()) {                       refreshFileList(files[i].getAbsolutePath());                   } else {                       String strFileName = files[i].getAbsolutePath().toLowerCase();                      System.out.println("---"+strFileName);                      filelist.add(files[i].getAbsolutePath());                                      }               }           }      }  

不使用递归：import java.io.File;import java.util.LinkedList;public class FileSystem {    public static void main(String[] args) {                long a = System.currentTimeMillis();        LinkedList list = new LinkedList();        File dir = new File("C:/Users/shibin/Desktop/tupian");        File file[] = dir.listFiles();        for (int i = 0; i < file.length; i++) {            if (file[i].isDirectory())                list.add(file[i]);            else                System.out.println(file[i].getAbsolutePath());        }        File tmp;        while (!list.isEmpty()) {            tmp = list.removeFirst();            if (tmp.isDirectory()) {                file = tmp.listFiles();                if (file == null)                    continue;                for (int i = 0; i < file.length; i++) {                    if (file[i].isDirectory())                        list.add(file[i]);                    else                        System.out.println(file[i].getAbsolutePath());                }            } else {                System.out.println(tmp.getAbsolutePath());            }        }                System.out.println(System.currentTimeMillis() - a);    }}