diff --git a/w2/DataCleaner.java b/w2/DataCleaner.java
new file mode 100644
index 0000000..e313d07
--- /dev/null
+++ b/w2/DataCleaner.java
@@ -0,0 +1,37 @@
+public class DataCleaner {
+    public static void main(String[] args) {
+        int[] sensorData = {85, -5, 92, 0, 105, 999, 88, 76};
+        int validSum = 0;   // 有效数据总和
+        int validCount = 0; // 有效数据个数
+
+        // 遍历传感器数据
+        for (int i = 0; i < sensorData.length; i++) {
+            int data = sensorData[i];
+
+            // 规则3：遇到999 → 致命错误，终止整个循环
+            if (data == 999) {
+                System.out.println("致命错误：传感器掉线，终止处理");
+                break;
+            }
+
+            // 规则2：无效数据（0/负数 或 >100且≠999）→ continue跳过
+            if (data <= 0 || (data > 100 && data != 999)) {
+                System.out.println("警告：发现越界数据 " + data + "，已跳过");
+                continue;
+            }
+
+            // 有效数据：累加和计数
+            validSum += data;
+            validCount++;
+        }
+
+        // 规则4：最终输出
+        if (validCount > 0) {
+            // 避免整数除法陷阱，转double计算平均值
+            double average = (double) validSum / validCount;
+            System.out.println("有效数据平均值：" + average);
+        } else {
+            System.out.println("无有效数据");
+        }
+    }
+}
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