data classes which provides equality testing and can be made immutable using the frozen parameter.

from dataclasses import dataclass

@dataclass(frozen=True)class StreetAddress: """Represents a street address."""

street: str city: str

Java

Value objects are available since Java 14, as data records

Unlike C# and C++, Java has no support for custom value types at the language level. Every custom type is a reference type, and therefore