diff --git a/Java/Big O/Example_12/Example.java b/Java/Big O/Example_12/Example.java
new file mode 100644
index 000000000..096348128
--- /dev/null
+++ b/Java/Big O/Example_12/Example.java	
@@ -0,0 +1,24 @@
+package Example_12;
+
+public class Example {
+
+    void permutation(String str) {
+        permutation(str, "");
+    }
+
+    void permutation(String str, String prefix){
+        if(str.length() == 0){
+            System.out.println(prefix);
+        } else {
+            for(int i = 0; i < str.length(); i++){
+                String rem = str.substring(0, i) + str.substring(i + 1);
+                permutation(rem, prefix + str.charAt(i));
+            }
+        }
+    }
+    
+    public static void main(String[] args) {
+        Example ex = new Example();
+        ex.permutation("abcd");
+    }
+}