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double-dispatch

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pattern
Double Dispatch
double-dispatch
/patterns/double-dispatch/
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Java
Difficulty-Intermediate
Idiom

Intent

Double Dispatch pattern is a way to create maintainable dynamic behavior based on receiver and parameter types.

alt text

Applicability

Use the Double Dispatch pattern when

  • the dynamic behavior is not defined only based on receiving object's type but also on the receiving method's parameter type.

Real world examples