数组返回 null .. 生成随机词

Question

我正在尝试制作一个 class 来生成随机单词。到目前为止，我的选择是 Scanner 或 BufferReader 我猜。这是我认为最有效的代码，但是当我运行我得到 null.

public return randomWord getter 也会授予对 main class 中单词的访问权限吗？

    private static final String filepath = "/assets/words.txt";
    public String randomWord;
    public Random rand;
    private ArrayList<String> words = new ArrayList<String>();


    public void WordGenerator() {


        rand = new Random();
        String line;

        try {

            InputStream WordsFile = getClass().getResourceAsStream(filepath);
            BufferedReader br = new BufferedReader(new InputStreamReader(WordsFile));
            if(!br.ready()){
                System.out.println("No File");
            }
            else while ((line = br.readLine()) != null) {
                words.add(line);
            }
            br.close();
        }
        catch (IOException e) {
            System.out.println("Something is wrong");
        }

        int size = words.size();
        Random rn = new Random();
        int randWord = rn.nextInt(size);
        randomWord = words.get(randWord);
        System.out.println(randomWord);
    }
}

Answer 1

我认为您真正需要阅读文件的是删除 InputStream 行并将 BufferedReader 替换为以下行：

BufferedReader br = new BufferedReader(new FileReader(filepath));

因此您的代码将如下所示：

import java.io.*;
import java.util.ArrayList;
import java.util.Random;

public class WordGeneratorClass
{
   private static final String filepath="../assets/words.txt";
   public String randomWord;
   public Random rand;
   private ArrayList<String> words=new ArrayList<String>();

   public void WordGenerator()
   {
        rand=new Random();
        String line;

        try
        {
           BufferedReader br = new BufferedReader(new FileReader(filepath));

           if(!br.ready())
           {
            System.out.println("No File");
           }
           else while((line=br.readLine())!=null)
           {
              words.add(line);
           }
           br.close();
        }
        catch (IOException e)
        {
           e.printStackTrace();
        }

        int size=words.size();
        Random rn=new Random();
        int randWord=rn.nextInt(size);

        randomWord=words.get(randWord);

        System.out.println(randomWord);
   }

   public static void main(String args[])
   {
      WordGeneratorClass gen = new WordGeneratorClass();
      gen.WordGenerator();
   }
}

确保您的 assets/words.txt 存在。

编辑
似乎问题也与您的 words.txt 的路径有关。上面的代码假定 assets/words/words.txt 与源代码位于同一目录中。更多信息，请查看here.

数组返回 null .. 生成随机词

Array returning null .. Generate random word

java

arrays

random

file

bufferedreader