java - 为什么我得到 "null"作为输出字符串？ java

Question

我想要做的是从文件中读取(在本例中该文件包含超过 100,000 行)并将值存储在数组中，然后打印出前 10 行。然而，当我运行该程序时，我得到第一行，然后是 9 行“null”，这显然不是我想要的!这是代码，如有任何提示，我们将不胜感激。

import java.io.*;
import java.util.Scanner;

public class DawsonZachA5Q2{
  public static void main(String[] args){

Scanner keyboard = new Scanner(System.in);

 System.out.println("Enter a size for the number of letters for words: ");
int size = keyboard.nextInt();//prompts user for input
String[] array = new String[27000];

    try {
       File file = new File("big-word-list.txt");
      Scanner scanner = new Scanner(file);


        // Start a line count and declare a string to hold our current line.
        int linecount=0;

        // Tells user what we're doing
        System.out.println("Searching for words with " + size + " letters in file...");
        int wordCount=0;

        while (scanner.hasNext()){
          int i = 0;
          String word = scanner.next();

          if(size == word.length()){
            wordCount++;
            array[i]=word;
            i++;
            //add word to array
          // increase the count and find the place of the word
        }
        }

        linecount++;






            System.out.println(wordCount);

            System.out.println(wordCount+" words were found that have "+size+ " letters.");//final output


          for(int o = 0; o<10; o++){
            System.out.println(array[o]);
          }


       scanner.close();
    }// our catch just in case of error
    catch (IOException e) {
        System.out.println("Sorry! File not found!");
    }



  } // main


} // class

Answer 1

在 while 循环之外定义 int i = 0;。每次循环运行时它都会设置为零。这就是问题所在。