Question

这是我目前正在尝试阅读的文本文件：

Buffalo
Montreal
Boston
Ottawa
Toronto

每当我运行这段代码时，我的数组中的5个元素都会打印为“null”，所以我不知道我是不是正确地将信息存储到数组中。这是我到目前为止的代码！（我正在使用Ready To Program IDE）

// The "Hockey" class.
import java.awt.*;
import hsa.Console;
import java.io.*;

public class Hockey
{
    static Console c;           // The output console

    public static void main (String[] args) throws IOException
    {
        c = new Console ();

        //setting up file reading
        FileReader fr = new FileReader ("cities.txt");
        BufferedReader br = new BufferedReader (fr);

        //initialising array
        String cities[] = new String [5];

        //loop to read in the 5 entries
        for (int i = 0 ; i > cities.length ; i++)
        {
            cities [i] = br.readLine ();
        }

        //loop to print all elements of "cities" to the console
        for (int i = 0 ; i < cities.length ; i++)
        {
            c.println (cities [i]);
        }
            // Place your program here.  'c' is the output console
    } // main method

} // Hockey class

感谢您的所有帮助！

Answer 1

你的for循环条件不正确。

//loop to read in the 5 entries
for (int i = 0 ; i > cities.length ; i++) //reads as (i greater than cities.length)
{                ^^^^^^^^^^^^^^^^^
    cities [i] = br.readLine ();
}

上面应该是：i < cities.length;（我小于cities.length）

循环没有运行，这解释了为什么你的数组没有填充。

我在将文本读入数组时遇到了麻烦，我需要在此代码中更改哪些内容？

1 个答案: