Bindings overview

通过创建一个bind，可以往Guice map中插入一条新的记录entry。

有这么多种bind：

• Linked Bindings
• Binding Annotations
• Instance Bindings
• @Provides Methods
• Provider Bindings
• Untargeted Bindings
• Constructor Bindings
• Built-in Bindings
• Just-In-Time Bindings
• Multibindings
• Restricting the Binding Source

这句话不懂： The injector also includes bindings for the providers of its other bindings.