filedemo.java

显示文件或者文件夹

import java.io.*;
public class FileDemo
{
   public static void main(String[] args)
   {
      byte buf[]=new byte[255];
      System.out.println("请输入想创建的文件名（可以带路径）:");
      try
      {   System.in.read(buf,0,255);
      }
      catch(Exception e)
      {  System.out.println("Error:"+e.toString());
      }
      String FileName=new String(buf);
      File f1=new File(FileName.trim());
      if(f1.exists())
      {
          if(f1.isFile())
          {
            System.out.println("File Name:"+f1.getName());
            System.out.println("Path:"+f1.getPath());
            System.out.println("Abs.Path:"+f1.getAbsolutePath());
            System.out.println("Writable:"+f1.canWrite());
            System.out.println("Readable:"+f1.canRead());
            System.out.println("Length:"+f1.length()+"字节");
          }
          else
          {
             String s[]=f1.list();
            System.out.println("文件夹："+f1+"共有"+s.length+"对象");
            for(int i=0;i<s.length;i++)
                  System.out.println(s[i]);
          }
       }
       else
          f1.mkdir();
   }
}