diff --git a/Hashing/countUniqueElement.java b/Hashing/countUniqueElement.java
new file mode 100644
index 0000000..6237be5
--- /dev/null
+++ b/Hashing/countUniqueElement.java
@@ -0,0 +1,12 @@
+package Hashing;
+import java.util.*;
+public class countUniqueElement {
+    public static void main(String[] args) {
+        int arr[]={4,3,2,5,6,7,3,4,2,1};
+        HashSet<Integer>set=new HashSet<>();
+        for(int i=0;i<arr.length;i++){
+            set.add(arr[i]);
+        }
+        System.out.println(set.size());
+    }
+}