计算机二级辅导:java遍历文件夹的两种方法
发布时间：2010/3/13 9:17:06 来源：城市学习网 编辑：MOON
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);
}
}
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。
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