Conceptual

Question 1

What is dependency injection? What problem does it solve?

Answer 1

Dependency injection (DI) is the concept in which objects get other required objects from outside. It helps to decouple.

Question 2

Name three types of dependency injection.

Answer 2

1) constructor injection
2) method injection
3) Property injection

Question 3

What is the DRY principle?

Answer 3

DRY stands for Don’t Repeat Yourself. In Java, it means don’t write the same code repeatedly.

Question 4

What do we mean by “separation of concerns”? Why is it important? Is it?

Answer 4

is a design principle for separating a computer program into distinct sections. Each section addresses a separate concern, a set of information that affects the code of a computer program.

Question 5

What are common logical application layers?

Question 6

What is the MVC pattern? In which layers do we implement it?

Question 7

What is a design pattern? Name one other than MVC.