Java示例比较两个字符串

import java.io.*;



public class Main {

   public static void main(String[] args) {

      File dir = new File("F:");

      File[] files = dir.listFiles();

      FileFilter fileFilter = new FileFilter() {

         public boolean accept(File file) {

            return file.isDirectory();

         }

      };

      files = dir.listFiles(fileFilter);

      System.out.println(files.length);



      if (files.length == 0) {

         System.out.println("Either dir does not exist or is not a directory");

      } else {

         for (int i = 0; i< files.length; i++) {

            File filename = files[i];

            System.out.println(filename.toString());

         }

      }

   }

}