From 6cb7ee0f9762224669c0adbc11c1bf9e73133cb6 Mon Sep 17 00:00:00 2001
From: daguimu <daguimu.geek@gmail.com>
Date: Thu, 26 Mar 2026 10:08:41 +0800
Subject: [PATCH] fix: Correct Multiset example in TypeAdapterFactory Javadoc

The code sample used `typeToken.getRawType() != Multiset.class` which
only matches the exact Multiset class, not its subtypes like
HashMultiset or LinkedHashMultiset. This causes the factory to return
null for all practical Multiset implementations, falling through to
CollectionTypeAdapterFactory instead.

Change to `!Multiset.class.isAssignableFrom(typeToken.getRawType())`
to correctly match all Multiset subtypes.

Fixes #1335
---
 gson/src/main/java/com/google/gson/TypeAdapterFactory.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gson/src/main/java/com/google/gson/TypeAdapterFactory.java b/gson/src/main/java/com/google/gson/TypeAdapterFactory.java
index 4473e59b7a..248414b89b 100644
--- a/gson/src/main/java/com/google/gson/TypeAdapterFactory.java
+++ b/gson/src/main/java/com/google/gson/TypeAdapterFactory.java
@@ -106,7 +106,7 @@
  * public class MultisetTypeAdapterFactory implements TypeAdapterFactory {
  *   public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
  *     Type type = typeToken.getType();
- *     if (typeToken.getRawType() != Multiset.class
+ *     if (!Multiset.class.isAssignableFrom(typeToken.getRawType())
  *         || !(type instanceof ParameterizedType)) {
  *       return null;
  *     }