Key entityKey = DatastoreOptions.newBuilder()
        .setDatabaseId("my-database-id")
        .build()
        .getService()
        .newKeyFactory()
        .setKind("EntityKind")
        .addAncestor(PathElement.of("ParentKind", 1L))
        .newKey(2L);
System.out.printf("Entity database ID: %s%n", entityKey.getDatabaseId());
System.out.printf("Parent database ID: %s%n", entityKey.getParent().getDatabaseId());