1 files changed, 9 insertions, 8 deletions
diff --git a/guava/src/com/google/common/collect/CollectCollectors.java b/guava/src/com/google/common/collect/CollectCollectors.java
index e0982ab0f..2b23bd25a 100644
--- a/guava/src/com/google/common/collect/CollectCollectors.java
+++ b/guava/src/com/google/common/collect/CollectCollectors.java
@@ -195,14 +195,13 @@ final class CollectCollectors {
         ImmutableMap.Builder<K, V>::new,
         (builder, input) -> builder.put(keyFunction.apply(input), valueFunction.apply(input)),
         ImmutableMap.Builder::combine,
-        ImmutableMap.Builder::build);
+        ImmutableMap.Builder::buildOrThrow);
   }
 
-  public static <T extends @Nullable Object, K, V>
-      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-          Function<? super T, ? extends K> keyFunction,
-          Function<? super T, ? extends V> valueFunction,
-          BinaryOperator<V> mergeFunction) {
+  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+      Function<? super T, ? extends K> keyFunction,
+      Function<? super T, ? extends V> valueFunction,
+      BinaryOperator<V> mergeFunction) {
     checkNotNull(keyFunction);
     checkNotNull(valueFunction);
     checkNotNull(mergeFunction);
@@ -227,7 +226,7 @@ final class CollectCollectors {
         () -> new ImmutableSortedMap.Builder<K, V>(comparator),
         (builder, input) -> builder.put(keyFunction.apply(input), valueFunction.apply(input)),
         ImmutableSortedMap.Builder::combine,
-        ImmutableSortedMap.Builder::build,
+        ImmutableSortedMap.Builder::buildOrThrow,
         Collector.Characteristics.UNORDERED);
   }
 
@@ -256,7 +255,7 @@ final class CollectCollectors {
         ImmutableBiMap.Builder<K, V>::new,
         (builder, input) -> builder.put(keyFunction.apply(input), valueFunction.apply(input)),
         ImmutableBiMap.Builder::combine,
-        ImmutableBiMap.Builder::build,
+        ImmutableBiMap.Builder::buildOrThrow,
         new Collector.Characteristics[0]);
   }
 
@@ -464,4 +463,6 @@ final class CollectCollectors {
           return multimap1;
         });
   }
+
+  private CollectCollectors() {}
 }