diff --git a/alternatingSum.java b/alternatingSum.java
new file mode 100644
index 0000000000..d505d1d601
--- /dev/null
+++ b/alternatingSum.java
@@ -0,0 +1,10 @@
+class Solution {
+    public int alternatingSum(int[] nums) {
+        int sum = 0;
+        for (int i = 0; i < nums.length; i++) {
+            if (i % 2 == 0) sum += nums[i];
+            else sum -= nums[i];
+        }
+        return sum;
+    }
+}