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import java.io.BufferedReader; |
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import java.io.FileReader; |
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import java.io.FileNotFoundException; |
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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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// 定义文件路径
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String fileName = "java/scores.txt"; |
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// 初始化变量
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int sum = 0; // 总分
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int count = 0; // 有效分数的数量
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System.out.println("开始读取文件: " + fileName); |
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// 1. 使用 try-with-resources 语法
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// 这样无论是否发生异常,br (BufferedReader) 都会自动关闭,无需手动调用 br.close()
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try (BufferedReader br = new BufferedReader(new FileReader(fileName))) { |
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String line; |
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// 循环读取每一行
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while ((line = br.readLine()) != null) { |
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try { |
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// 尝试将行内容转换为整数
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int score = Integer.parseInt(line.trim()); // 使用 trim() 去除可能的空格
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sum += score; |
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count++; |
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} catch (NumberFormatException e) { |
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// 2. 处理数字格式错误 (例如文件中包含 "abc")
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System.err.println("警告:发现非数字内容 '" + line + "',已跳过该行。"); |
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} |
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} |
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// 计算并输出平均分
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if (count > 0) { |
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double average = (double) sum / count; |
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System.out.println("----------------------"); |
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System.out.println("读取完成!"); |
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System.out.println("总分数: " + sum); |
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System.out.println("有效条目数: " + count); |
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System.out.println("平均分: " + average); |
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} else { |
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System.out.println("文件中没有有效的数字数据。"); |
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} |
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} catch (FileNotFoundException e) { |
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// 3. 处理文件不存在的情况
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System.err.println("错误:找不到文件 '" + fileName + "'。请确保文件在项目根目录下。"); |
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} catch (IOException e) { |
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// 4. 处理其他读取错误(如权限问题、磁盘损坏等)
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System.err.println("错误:读取文件时发生 IO 异常:" + e.getMessage()); |
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} |
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} |
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} |
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After Width: | Height: | Size: 514 KiB |
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After Width: | Height: | Size: 505 KiB |
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