commit 601cfca1df5f5465fbba67c684bf243a64cce6ac
author Yifan Hong <elsk@google.com> Wed May 24 12:20:17 2017 -0700
committer Yifan Hong <elsk@google.com> Wed May 24 12:21:28 2017 -0700
tree 907d68e636bd5fa29dfbdb0171607f7e139b44ad
parent 8e5be7c872761d81d84ecfa264c7a8d83a7354e2

Add @FunctionalInterface to callbacks.

Test: compiles
Change-Id: Ic1d462659da526fb7dce6f5c9d4d3fef9d4db8a1
Fixes: 38268323

generateJava.cpp

diff --git a/generateJava.cpp b/generateJava.cpp
index 9f8f1dd..0a589ae 100644
--- a/generateJava.cpp
+++ b/generateJava.cpp
@@ -272,8 +272,7 @@
         const bool needsCallback = method->results().size() > 1;
 
         if (needsCallback) {
-            out << "\npublic interface "
-                << method->name()
+            out << "\n@java.lang.FunctionalInterface\npublic interface " << method->name()
                 << "Callback {\n";
 
             out.indent();