Put simply, Guice alleviates the need for factories and the
use of new in your Java code. Think of Guice's @Inject as
the new new. You will still need to write factories in some
cases, but your code will not depend directly on them. Your
code will be easier to change, unit test and reuse in other
contexts.
Guice embraces Java's type safe nature, especially when it
comes to features introduced in Java 5 such as generics and
annotations. You might think of Guice as filling in missing
features for core Java. Ideally, the language itself would
provide most of the same features, but until such a
language comes along, we have Guice.

• Igor Vlasenko

• google-guice
• google-guice-javadoc