Method forEach

guava/src/com/google/common/collect/Maps.java:3896–3901

(Consumer<? super K> action)

    }

    @Override
    public void forEach(Consumer<? super K> action) {
      checkNotNull(action);
      // avoids entry allocation for those maps that allocate entries on iteration
      map.forEach((k, v) -> action.accept(k));
    }

    @Override
    public int size() {