Java 显示目录里面的文件

import java.io.*;

public class Main {
   public static void main(String[] args) {
      File dir = new File("C:");
      String[] children = dir.list();

      if (children == null) {
         System.out.println( "Either dir does not exist or is not a directory");
      } else {
         for (int i=0; i< children.length; i++) {
            String filename = children[i];
            System.out.println(filename);
         }
      }
   }
}