202506050218

w7/AI协助记录.txt

@@ -0,0 +1,3 @@
+1.借助AI复习异常处理相关知识点
+2.借助AI了解BufferReader是带缓冲区的高效文件读取器，按行读取文本，FileReader是打开本地txt文件的基础字符流，在使用之前需要import
+3.让AI帮忙修改润色代码，了解到try-with-resource不需要手写br.close();不需要添加final。

w7/BeforeTry.java

@@ -0,0 +1,19 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+
+
+public class Try {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new FileReader("scores.txt"));
+        String line;
+        int sum = 0;
+        int count = 0;
+        while ((line = br.readLine()) != null) {
+            sum += Integer.parseInt(line);
+            count++;
+        }
+        System.out.println("总分：" + sum);
+        System.out.println("平均分：" + (sum * 1.0 / count));
+        br.close();
+    }
+}

w7/Try.java

@@ -0,0 +1,36 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public class Try {
+    public static void main(String[] args) {
+        int sum = 0;
+        int count = 0;
+        
+        try (BufferedReader br = new BufferedReader(new FileReader("scores.txt"))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                try {
+                    sum += Integer.parseInt(line);
+                    count++;
+                } catch (NumberFormatException e) {
+                    System.out.println("警告：第" + (count + 1) + "行不是有效的数字: " + line);
+                }
+            }
+            
+            if (count > 0) {
+                System.out.println("总分：" + sum);
+                System.out.println("平均分：" + (sum * 1.0 / count));
+            } else {
+                System.out.println("没有有效的成绩数据");
+            }
+        } catch (FileNotFoundException e) {
+            System.out.println("错误：文件不存在或无法访问: " + e.getMessage());
+        } catch (IOException e) {
+            System.out.println("错误：文件读取失败: " + e.getMessage());
+        } catch (Exception e) {
+            System.out.println("错误：发生未知错误: " + e.getMessage());
+        }
+    }
+}