我无法更改程序的外壳，最终目标是从txt文件中的单词列表中选择一个随机单词。我已经浏览了很多次，一次又一次地检查了代码，尝试了许多不同的事情，但是每次我运行它时，它都可以毫无问题地进行编译，但是我从未得到任何输出。我什至尝试在私有函数中插入一些输出，但无济于事。谁能看到我的代码有什么问题或可以向我解释发生了什么？

import java.util.*;

    class PartOfSpeech
    {
      private String[] words;
      private Random random;
      private String filename;

      public PartOfSpeech(String filename)
      {
        this.filename = filename;
        this.read();
      }
      //this picks a random number and uses that number for the index of the array for which to return
      public String getRandomWord()
      {
        int index;
        index = random.nextInt(this.getCount());
        return words[index];
      }
      //this gets a count of how many lines of txt are in the file
      private int getCount()
      {
        Scanner fr = new Scanner(this.filename);
        int count = 0;
        while(fr.hasNextLine())
        {
         count++;
        }
       return count; 
      }
      //this creates a scanner and inserts each word from the txt file into an array
      private void read()
      {
        Scanner fr = new Scanner(this.filename);
        for(int i=0; i<this.getCount(); i++)
        {
         words[i] = fr.nextLine(); 
        }
      }

      public static void main(String[] args)
      {
        PartOfSpeech n = new PartOfSpeech("nouns.txt");
        System.out.print(n.getRandomWord());
      }
    }