Func1 (fcmjava-client 3.0.1 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 Func1<S>
```

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  S invoke()

- Method Detail
  - invoke
```
S invoke()
```