JAVA获取文件夹(文件)大小

import java.io.*;
public class FileTest {
 private StringBuffer sb;
 private static double sizes;
 private void recurseFile(String path){  
  if(path.indexOf(".") == -1){  
  for(File file: new File(path).listFiles()){
   if(file.isFile()){
    sizes += file.length();
   }else{
      recurseFile(file.toString());
   }
}else
   sizes = file.length();
  }
       }  
 public static void main(String args[]){
  String path = "c:/windows";
  FileTest ft = new FileTest();
  ft.recurseFile(path);
  System.out.println(sizes/1024);
 }
}