Question

我的数组打印的次数与其索引的打印次数相同，例如，将其打印为null

我正在尝试通过一个文本文件逐行打印该数组，该文本文件包含20行4条数据。

我尝试将print语句移到while循环之外，并且只在长行中显示该数组。

public static void main(String[] args)
{
    System.out.println("Hello! Welcome to my program. ");

    System.out.println("This Program will read and display a text file in an array");
    String[] arr;
    try
    {
        FileReader fr = new FileReader(file);
        BufferedReader br = new BufferedReader(fr);
        arr = new String[50];//
        int i = 0;
        String line;
        while ((line = br.readLine()) != null)
        {
            arr[i++] = line;
            System.out.println(i + "." + Arrays.toString(arr) + "\n");
        }
        br.close();

    } catch (IOException e)
    {
        System.out.println("File not Found");
    }
}

Answer 1

更改此部分。

while ((line = br.readLine()) != null)
{
    arr[i] = line; // was changed to arr[i] from arr[i++]
    System.out.println(i + "." + arr[i++] + "\n"); // was changed to arr[i++] from arr
}

Answer 2

尝试一下；

while ((line = br.readLine()) != null)
 {
    arr[i] = line;
    System.out.println(i + "." + arr[i++] + "\n");
  }

输出为; 0. 1 12 123 1234 12345 // 0.是索引

阵列打印太多次

2 个答案: