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656 B

package w7;
import java.io.BufferedReader;
import java.io.FileReader;
public class RawCode {
public static void main(String[] args) {
int sum = 0;
// 1. 资源未自动关闭(若中间抛异常,br.close()不会执行)
BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
String line;
while ((line = br.readLine()) != null) {
// 2. 无数字格式异常处理(若行不是整数,直接崩溃)
sum += Integer.parseInt(line);
}
// 3. 无IO异常处理(文件不存在/读取错误时直接崩溃)
br.close();
}
}