Method create

output/java_guava/1.4.19/Maps.java:617–619

(@Nullable V left, @Nullable V right)

    private final V right;

    static <V> ValueDifference<V> create(@Nullable V left, @Nullable V right) {
      return new ValueDifferenceImpl<V>(left, right);
    }

    private ValueDifferenceImpl(@Nullable V left, @Nullable V right) {
      this.left = left;