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.
Guice helps you design better APIs, and the Guice API itself sets a good example. Guice is not a kitchen sink. Each feature is justified with at least three use cases. When in doubt, it is left out. General functionality enables you to extend Guice rather than adding every feature to the core framework.
Guice aims to make development and debugging easier and faster, not harder and slower. In that vein, Guice steers clear of surprises and magic. You should be able to understand code with or without tools, though tools can make things even easier.
When errors do occur, Guice will go the extra mile to be able to generate helpful messages.
NOTE: Guice is licensed and distributed under the terms of the Apache License 2.0.
