Whats Dependency Injection?

Dependency injection is a design pattern which one use for achieve modular coding better testing and scalability.

For example a class car has create and there are few method but need add few more method from another class. We can achieve this many way like this

1. Inheritance.
2. Interface.
3. Abstraction.

But each time we need either extend or implement class.

Using dependency injection no need extend or implement. Just need to pass class name and class object as parameter through setter injection or constructor injection or interface injection.

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