Inject (guice 4.0)

```
@Target(value={METHOD,CONSTRUCTOR,FIELD})
@Retention(value=RUNTIME)
@Documented
public @interface Inject
```
Annotates members of your implementation class (constructors, methods and fields) into which the Injector should inject values. The Injector fulfills injection requests for:
- Every instance it constructs. The class being constructed must have exactly one of its constructors marked with @Inject or must have a constructor taking no parameters. The Injector then proceeds to perform field and method injections.
- Pre-constructed instances passed to Injector.injectMembers(java.lang.Object), LinkedBindingBuilder.toInstance(Object) and LinkedBindingBuilder.toProvider(javax.inject.Provider). In this case all constructors are, of course, ignored.
- Static fields and methods of classes which any Module has specifically requested static injection for, using Binder.requestStaticInjection(java.lang.Class<?>...).
In all cases, a member can be injected regardless of its Java access specifier (private, default, protected, public).
Author:

crazybob@google.com (Bob Lee)

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element and Description
`boolean`	`optional` If true, and the appropriate binding is not found, the Injector will skip injection of this method or field rather than produce an error.

- Element Detail
  - optional
```
public abstract boolean optional
```
    If true, and the appropriate binding is not found, the Injector will skip injection of this method or field rather than produce an error. When applied to a field, any default value already assigned to the field will remain (guice will not actively null out the field). When applied to a method, the method will only be invoked if bindings for all parameters are found. When applied to a constructor, an error will result upon Injector creation.
    
    Default:
    
    false

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