Java dependency injection design pattern allows us to remove the hard coded dependencies and make our application loosely coupled extendable and maintainable we can implement dependency injection in java to move the dependency resolution from compile time to runtime. Dependency injection is a concept valid for any programming language the general concept behind dependency injection is called inversion of control according to this concept a class should not configure its dependencies statically but should be configured from the outside a java class has a . Dependency injection dependency injection is a widely used design pattern that helps to separate your components behaviour from dependency resolution components declare their dependencies usually as constructor parameters and a dependency injection framework helps you wire together those components so you dont have to do so manually. Dependency injection allows the system to provide those references without you having to manage all of those dependencies at the application level this sounds complicated but its really not since this is not an in depth discussion of dependency injection check out the wikipedia page for several examples in various languages dagger
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