文件的遍历

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);
    }
}