diff --git a/exercises/diamond/src/main/java/.keep b/exercises/diamond/src/main/java/.keep
deleted file mode 100644
index e69de29bb..000000000
diff --git a/exercises/diamond/src/main/java/DiamondPrinter.java b/exercises/diamond/src/main/java/DiamondPrinter.java
new file mode 100644
index 000000000..c5d0f98d4
--- /dev/null
+++ b/exercises/diamond/src/main/java/DiamondPrinter.java
@@ -0,0 +1,9 @@
+import java.util.List;
+
+class DiamondPrinter {
+
+    List<String> printToList(char a) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+
+}