android/guava/src/com/google/common/collect/ImmutableTable.java
public static <R, C, V> ImmutableTable<R, C, V> of(R rowKey, C columnKey, V value) {
    return new SingletonImmutableTable<>(rowKey, columnKey, value);
  }
public static <R, C, V> ImmutableTable<R, C, V> of(R rowKey, C columnKey, V value) {
    return new SingletonImmutableTable<>(rowKey, columnKey, value);
  }
Returns an immutable table containing a single cell.