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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 ScoreAverage { |
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public static void main(String[] args) { |
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// 1. 定义变量:总分、有效成绩数量
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int sum = 0; |
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int count = 0; |
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// 2. 使用 try-with-resources 自动关闭流,确保文件一定被关闭
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try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) { |
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String line; |
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while ((line = br.readLine()) != null) { |
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// 去除首尾空格,避免空行或空格干扰
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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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// 3. 解析数字并累加
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int score = Integer.parseInt(line); |
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sum += score; |
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count++; |
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} |
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// 4. 计算并输出平均分(避免除以0)
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if (count > 0) { |
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double average = (double) sum / count; |
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System.out.println("读取到 " + count + " 个成绩"); |
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System.out.printf("总分:%d,平均分:%.2f%n", sum, 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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// 异常1:文件不存在/路径错误
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} catch (IOException e) { |
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System.out.println("文件读取错误:" + e.getMessage()); |
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System.out.println("请检查 scores.txt 文件是否存在,或路径是否正确"); |
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// 异常2:数字格式错误(比如文件里有非数字内容)
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} catch (NumberFormatException e) { |
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System.out.println("数据格式错误:文件中包含无法解析为整数的内容"); |
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System.out.println("错误详情:" + e.getMessage()); |
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// 兜底异常,捕获其他意外错误
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} catch (Exception e) { |
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System.out.println("程序发生意外错误:" + e.getMessage()); |
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e.printStackTrace(); |
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} |
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} |
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} |
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