diff --git a/java/2001-number-of-pairs-of-interchangeable-rectangles.java b/java/2001-number-of-pairs-of-interchangeable-rectangles.java
new file mode 100644
index 000000000..c87414528
--- /dev/null
+++ b/java/2001-number-of-pairs-of-interchangeable-rectangles.java
@@ -0,0 +1,15 @@
+class Solution {
+    public long interchangeableRectangles(int[][] rectangles) {
+        Map<Double, Long> count = new HashMap<>();
+        for (int[] rec : rectangles) {
+            double key = (double) rec[0] / rec[1];
+            count.put(key, count.getOrDefault(key, (long) 0) + 1);
+        }
+
+        long res = 0;
+        for (long c : count.values()) {
+            res += c * (c - 1) / 2;
+        }
+        return res;
+    }
+}
\ No newline at end of file