diff --git a/java/Controller.java b/java/Controller.java
new file mode 100644
index 0000000..70f722d
--- /dev/null
+++ b/java/Controller.java
@@ -0,0 +1,6 @@
+public class Controller {
+    public int selectMode(int sensor) {
+        if (sensor > 80) return 2;
+        return 1;
+    }
+}