Directory(目录)

//Using directories.
import java.io.File;
class DirList{
 public static void main(String[] args)
 {
  String strDirName = "c:/winnt";
  File f1 = new File(strDirName);
  if(f1.isDirectory()){
   System.out.println("Directory of " + strDirName); 
   String s[] = f1.list();

   for(int i=0;i<s.length;i++){
    File f = new File(strDirName +"/" + s[i]);
    if(f.isDirectory()){
     System.out.println(s[i] + "is a directory.");
    }else{
     System.out.println(s[i] + "is a file.");
    }
   }
  }else{
   System.out.println(strDirName + "is not a directory");
  }
 }
}