NonnullConsumer (retval 2.3.0 API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface NonnullConsumer<T>
```
A version of Consumer but with an explicit nonnull value.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void accept(T t)
  Accept the value into the consumer.

- Method Detail
  - accept
```
void accept(@Nonnull
            T t)
```
    Accept the value into the consumer. The caller must assert the non-null validity of the argument; the receiver should safely assume the argument is non-null.
    
    Parameters:
    
    t - parameter value, which must be non-null