Java中遍历文件夹的2种方法

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。???