Makudex Makudex - 1 year ago 89
Java Question

Why use Dependency injection when you can import a java class?

Could someone please explain to me why do we need to use the spring's dependency injection when you can just import a java class like:

import com.package.somejavaclass

I just wonder why?

Answer Source

DI and IoC

Dependency Injection (and Inversion of Control) have nothing to do with import. Dependency injection allows you to make runtime decisions instead of compile-time decisions. For example, how your class gets a database Connection. That is configuration over hard-coding.


The import statement allows you to not specify the fully-qualifed name of a class. That is, without import java.util.Date; you can still (for example)

System.out.println(new java.util.Date());
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