diff --git a/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num977.java b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num977.java
new file mode 100644
index 0000000..dad16a7
--- /dev/null
+++ b/src/main/java/com/cool/ling_cha_mount/sliding_windows/Num977.java
@@ -0,0 +1,30 @@
+package com.cool.ling_cha_mount.sliding_windows;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @Author: Cool
+ * @Date: 2024/11/06/18:06
+ * @Description: 977. 有序数组的平方
+ */
+public class Num977 {
+    public int[] sortedSquares(int[] nums) {
+        int index = 0;
+        int j = nums.length - 1;
+        int[] res = new int[nums.length];
+        int rIndex = nums.length - 1;
+        for (int i = 0; i < nums.length; i++) {
+            int a = nums[index] * nums[index];
+            int b = nums[j] * nums[j];
+            if (a > b) {
+                res[rIndex] = a;
+                index++;
+            } else {
+                res[rIndex] = b;
+                j--;
+            }
+            rIndex--;
+        }
+        return res;
+    }
+}