a.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:\\java\\");
        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);
    }
}

b.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:\\java");
        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());
            }
        }
    }
}
结论：经过测试，使用递归的方法b性能相对好一些。