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diff --git a/guava/src/com/google/common/base/FinalizableWeakReference.java b/guava/src/com/google/common/base/FinalizableWeakReference.java
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+++ b/guava/src/com/google/common/base/FinalizableWeakReference.java
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+/*
+ * Copyright (C) 2007 The Guava Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.common.base;
+
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+
+/**
+ * Weak reference with a {@code finalizeReferent()} method which a background thread invokes after
+ * the garbage collector reclaims the referent. This is a simpler alternative to using a {@link
+ * ReferenceQueue}.
+ *
+ * @author Bob Lee
+ * @since 2.0 (imported from Google Collections Library)
+ */
+public abstract class FinalizableWeakReference<T> extends WeakReference<T>
+    implements FinalizableReference {
+  /**
+   * Constructs a new finalizable weak reference.
+   *
+   * @param referent to weakly reference
+   * @param queue that should finalize the referent
+   */
+  protected FinalizableWeakReference(T referent, FinalizableReferenceQueue queue) {
+    super(referent, queue.queue);
+    queue.cleanUp();
+  }
+}