Method Injection
Method Injection is a dependency injection pattern where dependencies are passed directly to a method as parameters, rather than being set on the class or object. This allows for greater flexibility by enabling different dependencies to be supplied for each method call, making it useful for scenarios where dependencies vary per invocation. It is commonly used in software design to promote loose coupling and improve testability by decoupling the method's logic from its dependencies.
Developers should use Method Injection when a method's dependencies are not fixed and can change between calls, such as in event handlers, strategy patterns, or when implementing plugins. It is particularly valuable in unit testing, as it allows mocking dependencies easily by passing test doubles directly to the method, ensuring isolated and reliable tests without relying on global state or complex setup.