diff --git a/HelloWorld.java b/HelloWorld.java
new file mode 100644
index 0000000..4a96e6d
--- /dev/null
+++ b/HelloWorld.java
@@ -0,0 +1,5 @@
+public class HelloWorld {
+  public static void main(String[] args) {
+    System.out.println("Hello world!");
+  }
+}