Java 遍历指定目录下的目录

import java.io.File; import java.io.FileFilter; public class PrintDir { public static void main(String[] args) { File dir = new File("/"); File[] files = null; FileFilter fileFilter = new FileFilter() { @Override public boolean accept(File pathname) { return pathname.isDirectory(); } }; files=dir.listFiles(fileFilter); System.out.println(files.length); if (files.length ==0){ System.out.println("目录为空！！"); }else { for (int i=0; i<files.length; i++){ File filename = files[i]; System.out.println(filename.toString()); } } } }