@@ -0,0 +1,21 @@
+import java.util.*;
+
+class Diamond {
+    public static String print(int n) {
+
+        if (n < 0 || n % 2 == 0)
+            return null;
+
+        StringBuilder str = new StringBuilder();
+
+        for (int i = 1; i <= n; i += 2) {
+            str.append(" ".repeat((n - i) / 2)).append("*".repeat(i)).append("\n");
+        }
+
+        for (int i = n - 2; i > 0; i -= 2) {
+            str.append(" ".repeat((n - i) / 2)).append("*".repeat(i)).append("\n");
+        }
+
+        return str.toString();
+    }
+}