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import java.io.BufferedReader; |
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import java.io.FileReader; |
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import java.io.IOException; |
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import java.nio.file.Files; |
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import java.nio.file.Path; |
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import java.nio.file.Paths; |
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public class ScoreCalculator { |
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public static void main(String[] args) { |
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String fileName = "C:\\Users\\黄志楷\\Documents\\ocix\\学校相关\\jwork\\w7\\score"; |
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double average = calculateAverageScore(fileName); |
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if (!Double.isNaN(average)) { |
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System.out.printf("平均分: %.2f%n", average); |
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} |
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} |
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/** |
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* 计算成绩文件的平均分 |
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* @param fileName 文件名 |
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* @return 平均分,如果出错返回 NaN |
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*/ |
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public static double calculateAverageScore(String fileName) { |
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int sum = 0; |
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int count = 0; |
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// 1. 检查文件是否存在
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Path filePath = Paths.get(fileName); |
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if (!Files.exists(filePath)) { |
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System.err.println("错误: 文件 '" + fileName + "' 不存在!"); |
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return Double.NaN; |
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} |
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// 2. 使用 try-with-resources 确保流自动关闭
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try (BufferedReader br = new BufferedReader(new FileReader(fileName))) { |
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String line; |
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while ((line = br.readLine()) != null) { |
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// 跳过空行
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if (line.trim().isEmpty()) { |
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continue; |
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} |
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try { |
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int score = Integer.parseInt(line.trim()); |
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sum += score; |
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count++; |
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} catch (NumberFormatException e) { |
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// 数字格式错误,记录错误但继续处理其他行
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System.err.println("警告: 无效的数据格式 '" + line + "',已跳过此条记录"); |
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} |
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} |
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// 检查是否有有效数据
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if (count == 0) { |
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System.err.println("错误: 文件中没有有效的成绩数据!"); |
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return Double.NaN; |
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} |
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return (double) sum / count; |
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} catch (IOException e) { |
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// 读取错误
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System.err.println("错误: 读取文件 '" + fileName + "' 时发生异常!"); |
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System.err.println("详细信息: " + e.getMessage()); |
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return Double.NaN; |
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} |
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// 无需显式 close(),try-with-resources 会自动处理
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} |
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} |
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@ -0,0 +1,18 @@ |
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import java.io.BufferedReader; |
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import java.io.FileReader; |
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public class Scorecal { |
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public static void main(String[] args) throws Exception { |
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BufferedReader br = new BufferedReader(new FileReader("C:\\Users\\黄志楷\\Documents\\ocix\\学校相关\\jwork\\w7\\score")); |
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String line; |
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int sum = 0; |
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int count = 0; |
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while ((line = br.readLine()) != null) { |
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sum += Integer.parseInt(line); |
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count++; |
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} |
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br.close(); |
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System.out.println((double) sum / count); |
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} |
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} |
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@ -0,0 +1,7 @@ |
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11 |
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22 |
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33 |
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44 |
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74 |
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95 |
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这个不是分数 |
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After Width: | Height: | Size: 20 KiB |
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After Width: | Height: | Size: 13 KiB |
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