Optional (java port of Underscore.js 1.58 API)

public final class Optional<T>
extends Object

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static <T> Optional<T>`	`absent()`
`boolean`	`equals(Object o)`
`Optional<T>`	`filter(Predicate<? super T> predicate)`
`static <T> Optional<T>`	`fromNullable(T nullableReference)`
`T`	`get()`
`int`	`hashCode()`
`boolean`	`isEmpty()`
`boolean`	`isPresent()`
`<F> Optional<F>`	`map(Function<? super T,F> mapper)`
`static <T> Optional<T>`	`of(T arg)`
`T`	`or(T defaultValue)`
`T`	`orNull()`
`<X extends Throwable> T`	`orThrow(Supplier<? extends X> exceptionFunction)`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

public static <T> Optional<T> of(T arg)

public static <T> Optional<T> fromNullable(T nullableReference)

public static <T> Optional<T> absent()

public Optional<T> filter(Predicate<? super T> predicate)

public <F> Optional<F> map(Function<? super T,F> mapper)

public <X extends Throwable> T orThrow(Supplier<? extends X> exceptionFunction)
                                throws X extends Throwable

Class Optional<T>