Minor updates after recent changes for Java 8 APIs.

RELNOTES=n/a
PiperOrigin-RevId: 711817437

Author: cpovirk

android/guava-tests/test/com/google/common/base/StopwatchJavaTimeTest.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2008 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 com.google.common.annotations.GwtIncompatible;
+import com.google.common.annotations.J2ktIncompatible;
+import com.google.common.testing.FakeTicker;
+import java.time.Duration;
+import junit.framework.TestCase;
+import org.jspecify.annotations.NullUnmarked;
+
+/** Unit test for the {@code java.time} support in {@link Stopwatch}. */
+@J2ktIncompatible
+@GwtIncompatible
+@NullUnmarked
+public class StopwatchJavaTimeTest extends TestCase {
+  private final FakeTicker ticker = new FakeTicker();
+  private final Stopwatch stopwatch = new Stopwatch(ticker);
+
+  public void testElapsed_duration() {
+    stopwatch.start();
+    ticker.advance(999999);
+    assertEquals(Duration.ofNanos(999999), stopwatch.elapsed());
+    ticker.advance(1);
+    assertEquals(Duration.ofMillis(1), stopwatch.elapsed());
+  }
+}

android/guava/src/com/google/common/collect/CollectCollectors.java

@@ -42,7 +42,6 @@
 @GwtCompatible
 @SuppressWarnings("Java7ApiChecker")
 @IgnoreJRERequirement // used only from APIs with Java 8 types in them
-// (not used publicly by guava-android as of this writing, but we include it in the jar as a test)
 final class CollectCollectors {
 
   private static final Collector<Object, ?, ImmutableList<Object>> TO_IMMUTABLE_LIST =

android/guava/src/com/google/common/collect/TableCollectors.java

@@ -32,7 +32,6 @@
 @GwtCompatible
 @SuppressWarnings("Java7ApiChecker")
 @IgnoreJRERequirement // used only from APIs with Java 8 types in them
-// (not used publicly by guava-android as of this writing, but we include it in the jar as a test)
 final class TableCollectors {
 
   static <T extends @Nullable Object, R, C, V>