Use zip4j library to unpack encrypted files, get results with first file empty

 for(int i=0; i<password.length;i++){
      ZipFile zip = new ZipFile(path);
      if (zip.isEncrypted()) {
          zip.setPassword(password[i]);
      }
      try{
          zip.extractAll(neweachpath);
      } 
      catch(ZipException e)
      {if (e.getCode()==ZipExceptionConstants.WRONG_PASSWORD){
          //System.out.println("wrong password");
      }
  }
  }

      

        
        
        
      

    

I am using this piece of code to unpack a password file. The problem is there are many subfiles in the zip file, the first unpack is empty, the others are fine. If the zip file has one sub-file then the result is empty. Does anyone know how this happened? thank.

ps. iteration is just a way to check the password