1-dependency-injection.asciidoc

Table of Contents

• Dependency-Injection
• Links

Dependency-Injection

We want to play around with spring and test dependency-injection. Therefore we create packages, interfaces, and classes as in the following diagram:

So the idea is as followin:

• We create two components: CompoentA and ComponentB

• ComponentB can say hi to a given name by returning "Hello " + name

• ComponentA uses ComponentB to return a greeting (e.g. return sayHi("World"))

• Each component has an interface and an implementation

• Implementation is annotated with @Named

• ComponentAImpl uses ComponentB and gets it via @Inject annotation.

• Write a JUnit test ComponentATest that verifies the expected result of greet()

Links

• devon4j: dependency-injection