Optional (jems2 2.0.0 API)

All Known Implementing Classes:

Absent, Backed, Collapsed, Conditional, DelegatingOptional, First, FirstPresent, Frozen, Just, LazyDelegatingOptional, MapCollapsed, MapEntry, Mapped, Next, NextPresent, NullSafe, Present, Restrained, Sieved, Zipped
```
public interface Optional<T>
```
An optional value. In contrast to Java's Optional this an interface, so custom implementations can be developed.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isPresent()`	Returns whether the optional value is present.
`T`	`value()`	Returns the optional value.

- Method Detail
  - isPresent
```
boolean isPresent()
```
    Returns whether the optional value is present.
  - value
```
T value()
```
    Returns the optional value.
    
    Throws:
    
    java.util.NoSuchElementException - if the optional value is not present.