What is the difference between constructor injection and setter injection in dependency injection?

Question

Accepted Answer

Constructor injection passes dependencies through a class constructor, while setter injection uses setter methods.

Constructor injection is done by passing dependencies as parameters to the constructor.
Setter injection involves calling setter methods to set the dependencies after the object is created.
Constructor injection ensures that all required dependencies are provided at the time of object creation.
Setter injection allows for optional dependencies to be set after the object is created.
Constructor injection leads to immutable objects, while setter injection allows for changes to dependencies at runtime.

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