Question

Constructor-based DI is preferred for ___________

(a) Optional dependencies

(b) Mandatory dependencies

(c) All dependencies

(d) No dependency

The question was asked by my college professor while I was bunking the class.

My question is from The Controller Component topic in chapter Mastering JUnit of JUnit

Answer 1

The correct choice is (b) Mandatory dependencies

The explanation is: Since there has to be at least one argument, Constructor-based DI is preferred for Mandatory dependencies.