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lang-java
build()method from the example you provided and setting the PersonImpl's fields toprotected. But then one would need to keep the package very small to keep the class effectively immutable.Map.of()family of static methods of thejava.util.Mapinterface will create concrete maps using other top-level classes that in turn depend on theMapinterface. Not a problem at all. UsingMap.of()to create an empty map is certainly a nicer API than having to resort to something likeMapFactory.create().