我已经编译并调试了我的程序，但是没有输出。我怀疑bufferedreader传递给array方法的问题，但我对java不够精通，不知道它是什么，也不知道如何修复它。。。请帮忙！：）

public class Viennaproj {

 private String[] names;
  private int longth;
  //private String [] output; 

  public Viennaproj(int length, String line) throws IOException
  {
     this.longth = length;
     this.names = new String[length];
     String file = "names.txt";
     processFile("names.txt",5);
     sortNames();
  }

 public void processFile (String file, int x) throws IOException, FileNotFoundException{
BufferedReader reader = null;

try {
//File file = new File("names.txt");
reader = new BufferedReader(new FileReader(file));

String line;
while ((line = reader.readLine()) != null) {
    System.out.println(line);
}

} catch (IOException e) {
e.printStackTrace();
} finally {
try {
    reader.close();
} catch (IOException e) {
    e.printStackTrace();
}
}

   }

  public void sortNames()
  {
     int counter = 0;
     int[] lengths = new int[longth];
     for( String name : names)
     {
        lengths[counter] = name.length();
        counter++;
     }

     for (int k = 0; k<longth; k++)
     {
        int counter2 = k+1;
        while (lengths[counter2]<lengths[k]){
         String temp2;
         int temp;
         temp = lengths[counter2];
         temp2 = names[counter2];
         lengths[counter2] = lengths[k];
         names[counter2] = names[k];
         lengths[k] = temp;
         names[k] = temp2;

         counter2++;
        }

     }

  }

  public String toString()
  {
     String output = new String();

     for(String name: names)
     {
        output = name + "/n" + output;
     }

     return output;
  }

  public static void main(String[] args)
  {
    String output = new String ();
    output= output.toString();
     System.out.println(output+"");

  }

}