help me

[Jackson1]

What are the benefits of Dependency Injection.............?

[mrhcharlie]

Hello,

Reduced Dependencies

Dependency injection makes it possible to eliminate, or at least reduce, a components unnecessary dependencies. A component is vulnerable to change in its dependencies. If a dependency changes, the component might have to adapt to these changes. For instance, if a method signature of a dependency is changed, the component will have to change that method call. When a components dependencies are reduced it is less vulnerable to changes.

More Reusable Code

Reducing a components dependencies typically makes it easier to reuse in a different context. The fact that dependencies can be injected and therefore configured externally, increases the reusability of that component. If a different implementation of some interface is needed in a different context, or just a different configuration of the same implementation, the component can be configured to work with that implementation. There is no need to change the code.