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: Use this when constructors have many parameters (especially optional ones).

: Always override them together. If you break this, HashMap and HashSet will fail. : Use this when constructors have many parameters

: Inheritance breaks encapsulation; use wrappers or delegates instead. : Use this when constructors have many parameters

: Always specify types (e.g., List , not List ) to catch errors at compile time. : Use this when constructors have many parameters

: Enums are full-fledged classes providing type safety and powerful features.