public File[] getFolderFile3()
    {
        File dir = new File("");
        String sb =dir.getAbsolutePath();
        File sub = new File(sb);
        File []files = sub.listFiles();
        File [] newFile= new File[30];
        int j=0;
        for(int i=0; i<files.length; i++ )
        {
             if(files[i].isFile())
             {
                    String name =files[i].getName();
                    int point =name.indexOf(".");
                    String rightPart=name.substring(point,name.length());

                    System.out.println(rightPart);
                    System.out.println(rightPart.equals(".txt.bak.bak"));
                 if(rightPart.equals(".txt.bak.bak"));
                {

                         newFile[j++]=files[i];
                         System.out.println(files[i]);
                         System.out.println("12312");  
                         System.out.println(newFile[j]);
                  }    
                 
              
             }
        }
        return newFile;
        
    }
    请问  newFile[j] 为什么是NULL