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: Always override them together. If you break this, HashMap and HashSet will fail.

: Implement it for any class with a natural ordering. 3. Classes and Interfaces : Always override them together

: Always specify types (e.g., List , not List ) to catch errors at compile time. use wrappers or delegates instead.

: Don't use them for normal control flow. : Always override them together

: Favor immutable classes (like String ) to make code thread-safe and less buggy.

: Inheritance breaks encapsulation; use wrappers or delegates instead.