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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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public class ScoreCalculator { |
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public static void main(String[] args) { |
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String fileName = "scores.txt"; |
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int sum = 0; |
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int count = 0; |
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// try-with-resources 自动关闭流,无需手动写 br.close()
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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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// 去除字符串前后空格,避免空行或空格影响解析
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line = line.trim(); |
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if (line.isEmpty()) { |
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continue; // 跳过空行
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} |
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try { |
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// 解析成绩为整数
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int score = Integer.parseInt(line); |
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sum += score; |
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count++; |
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} catch (NumberFormatException e) { |
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// 数字格式错误处理
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System.err.println("警告:无法解析成绩 '" + line + "',跳过该数据"); |
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} |
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} |
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// 计算平均分
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if (count > 0) { |
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double average = (double) sum / count; |
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System.out.println("平均分:" + average); |
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} else { |
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System.out.println("文件中没有有效成绩数据"); |
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} |
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} catch (IOException e) { |
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// 文件不存在、读取错误处理
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System.err.println("读取文件时发生错误:" + e.getMessage()); |
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e.printStackTrace(); |
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} |
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} |
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} |
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