我在將文本讀入數組時遇到麻煩，我需要在此代碼中進行哪些更改？

Question

這是我嘗試從中讀取的當前文本文件：

Buffalo
Montreal
Boston
Ottawa
Toronto

每當我運行此代碼時，我數組中的5個元素都會顯示為“ null”，因此我不知何故沒有將信息正確存儲到數組中。 這是我到目前為止的代碼！ （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

感謝您所有的幫助！

Answer 1

您的for循環條件不正確。

//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 ();
}

上面應該是： i < cities.length; （我小於city.length）

循環未運行，這說明了為什么未填充陣列。