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Added in API level 24

Summary: Nested Classes | Ctors | Methods | Inherited Methods | [Expand All]

CompletableFuture

public class CompletableFuture
extends Object implements Future<T>, CompletionStage<T>

java.lang.Object
↳	java.util.concurrent.CompletableFuture<T>

A Future that may be explicitly completed (setting its value and status), and may be used as a CompletionStage, supporting dependent functions and actions that trigger upon its completion.

When two or more threads attempt to complete, completeExceptionally, or cancel a CompletableFuture, only one of them succeeds.

In addition to these and related methods for directly manipulating status and results, CompletableFuture implements interface CompletionStage with the following policies:

Actions supplied for dependent completions of non-async methods may be performed by the thread that completes the current CompletableFuture, or by any other caller of a completion method.
All async methods without an explicit Executor argument are performed using the commonPool() (unless it does not support a parallelism level of at least two, in which case, a new Thread is created to run each task). To simplify monitoring, debugging, and tracking, all generated asynchronous tasks are instances of the marker interface CompletableFuture.AsynchronousCompletionTask. Operations with time-delays can use adapter methods defined in this class, for example: supplyAsync(supplier, delayedExecutor(timeout, timeUnit)). To support methods with delays and timeouts, this class maintains at most one daemon thread for triggering and cancelling actions, not for running them.
All CompletionStage methods are implemented independently of other public methods, so the behavior of one method is not impacted by overrides of others in subclasses.

CompletableFuture also implements Future with the following policies:

Since (unlike FutureTask) this class has no direct control over the computation that causes it to be completed, cancellation is treated as just another form of exceptional completion. Method cancel has the same effect as completeExceptionally(new CancellationException()). Method isCompletedExceptionally() can be used to determine if a CompletableFuture completed in any exceptional fashion.
In case of exceptional completion with a CompletionException, methods get() and get(long, TimeUnit) throw an ExecutionException with the same cause as held in the corresponding CompletionException. To simplify usage in most contexts, this class also defines methods join() and getNow(T) that instead throw the CompletionException directly in these cases.

Arguments used to pass a completion result (that is, for parameters of type T) for methods accepting them may be null, but passing a null value for any other parameter will result in a NullPointerException being thrown.

Summary

Nested classes
`interface`	`CompletableFuture.AsynchronousCompletionTask` A marker interface identifying asynchronous tasks produced by `async` methods.

Public constructors
`CompletableFuture()` Creates a new incomplete CompletableFuture.

Public methods
`CompletableFuture<Void>`	`acceptEither(CompletionStage<? extends T> other, Consumer<? super T> action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed with the corresponding result as argument to the supplied action.
`CompletableFuture<Void>`	`acceptEitherAsync(CompletionStage<? extends T> other, Consumer<? super T> action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the corresponding result as argument to the supplied action.
`CompletableFuture<Void>`	`acceptEitherAsync(CompletionStage<? extends T> other, Consumer<? super T> action, Executor executor)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using the supplied executor, with the corresponding result as argument to the supplied action.
`static CompletableFuture<Void>`	`allOf(CompletableFuture...<?> cfs)` Returns a new CompletableFuture that is completed when all of the given CompletableFutures complete.
`static CompletableFuture<Object>`	`anyOf(CompletableFuture...<?> cfs)` Returns a new CompletableFuture that is completed when any of the given CompletableFutures complete, with the same result.
`<U> CompletableFuture<U>`	`applyToEither(CompletionStage<? extends T> other, Function<? super T, U> fn)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed with the corresponding result as argument to the supplied function.
`<U> CompletableFuture<U>`	`applyToEitherAsync(CompletionStage<? extends T> other, Function<? super T, U> fn)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the corresponding result as argument to the supplied function.
`<U> CompletableFuture<U>`	`applyToEitherAsync(CompletionStage<? extends T> other, Function<? super T, U> fn, Executor executor)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using the supplied executor, with the corresponding result as argument to the supplied function.
`boolean`	`cancel(boolean mayInterruptIfRunning)` If not already completed, completes this CompletableFuture with a `CancellationException`.
`boolean`	`complete(T value)` If not already completed, sets the value returned by `get()` and related methods to the given value.
`boolean`	`completeExceptionally(Throwable ex)` If not already completed, causes invocations of `get()` and related methods to throw the given exception.
`static <U> CompletableFuture<U>`	`completedFuture(U value)` Returns a new CompletableFuture that is already completed with the given value.
`CompletableFuture<T>`	`exceptionally(Function<Throwable, ? extends T> fn)` Returns a new CompletableFuture that is completed when this CompletableFuture completes, with the result of the given function of the exception triggering this CompletableFuture's completion when it completes exceptionally; otherwise, if this CompletableFuture completes normally, then the returned CompletableFuture also completes normally with the same value.
`T`	`get(long timeout, TimeUnit unit)` Waits if necessary for at most the given time for this future to complete, and then returns its result, if available.
`T`	`get()` Waits if necessary for this future to complete, and then returns its result.
`T`	`getNow(T valueIfAbsent)` Returns the result value (or throws any encountered exception) if completed, else returns the given valueIfAbsent.
`int`	`getNumberOfDependents()` Returns the estimated number of CompletableFutures whose completions are awaiting completion of this CompletableFuture.
`<U> CompletableFuture<U>`	`handle(BiFunction<? super T, Throwable, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes either normally or exceptionally, is executed with this stage's result and exception as arguments to the supplied function.
`<U> CompletableFuture<U>`	`handleAsync(BiFunction<? super T, Throwable, ? extends U> fn, Executor executor)` Returns a new CompletionStage that, when this stage completes either normally or exceptionally, is executed using the supplied executor, with this stage's result and exception as arguments to the supplied function.
`<U> CompletableFuture<U>`	`handleAsync(BiFunction<? super T, Throwable, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes either normally or exceptionally, is executed using this stage's default asynchronous execution facility, with this stage's result and exception as arguments to the supplied function.
`boolean`	`isCancelled()` Returns `true` if this CompletableFuture was cancelled before it completed normally.
`boolean`	`isCompletedExceptionally()` Returns `true` if this CompletableFuture completed exceptionally, in any way.
`boolean`	`isDone()` Returns `true` if completed in any fashion: normally, exceptionally, or via cancellation.
`T`	`join()` Returns the result value when complete, or throws an (unchecked) exception if completed exceptionally.
`void`	`obtrudeException(Throwable ex)` Forcibly causes subsequent invocations of method `get()` and related methods to throw the given exception, whether or not already completed.
`void`	`obtrudeValue(T value)` Forcibly sets or resets the value subsequently returned by method `get()` and related methods, whether or not already completed.
`CompletableFuture<Void>`	`runAfterBoth(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action.
`CompletableFuture<Void>`	`runAfterBothAsync(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action using this stage's default asynchronous execution facility.
`CompletableFuture<Void>`	`runAfterBothAsync(CompletionStage<?> other, Runnable action, Executor executor)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action using the supplied executor.
`CompletableFuture<Void>`	`runAfterEither(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action.
`CompletableFuture<Void>`	`runAfterEitherAsync(CompletionStage<?> other, Runnable action, Executor executor)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action using the supplied executor.
`CompletableFuture<Void>`	`runAfterEitherAsync(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action using this stage's default asynchronous execution facility.
`static CompletableFuture<Void>`	`runAsync(Runnable runnable)` Returns a new CompletableFuture that is asynchronously completed by a task running in the `commonPool()` after it runs the given action.
`static CompletableFuture<Void>`	`runAsync(Runnable runnable, Executor executor)` Returns a new CompletableFuture that is asynchronously completed by a task running in the given executor after it runs the given action.
`static <U> CompletableFuture<U>`	`supplyAsync(Supplier<U> supplier)` Returns a new CompletableFuture that is asynchronously completed by a task running in the `commonPool()` with the value obtained by calling the given Supplier.
`static <U> CompletableFuture<U>`	`supplyAsync(Supplier<U> supplier, Executor executor)` Returns a new CompletableFuture that is asynchronously completed by a task running in the given executor with the value obtained by calling the given Supplier.
`CompletableFuture<Void>`	`thenAccept(Consumer<? super T> action)` Returns a new CompletionStage that, when this stage completes normally, is executed with this stage's result as the argument to the supplied action.
`CompletableFuture<Void>`	`thenAcceptAsync(Consumer<? super T> action, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, is executed using the supplied Executor, with this stage's result as the argument to the supplied action.
`CompletableFuture<Void>`	`thenAcceptAsync(Consumer<? super T> action)` Returns a new CompletionStage that, when this stage completes normally, is executed using this stage's default asynchronous execution facility, with this stage's result as the argument to the supplied action.
`<U> CompletableFuture<Void>`	`thenAcceptBoth(CompletionStage<? extends U> other, BiConsumer<? super T, ? super U> action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed with the two results as arguments to the supplied action.
`<U> CompletableFuture<Void>`	`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T, ? super U> action, Executor executor)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using the supplied executor, with the two results as arguments to the supplied action.
`<U> CompletableFuture<Void>`	`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T, ? super U> action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied action.
`<U> CompletableFuture<U>`	`thenApply(Function<? super T, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes normally, is executed with this stage's result as the argument to the supplied function.
`<U> CompletableFuture<U>`	`thenApplyAsync(Function<? super T, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes normally, is executed using this stage's default asynchronous execution facility, with this stage's result as the argument to the supplied function.
`<U> CompletableFuture<U>`	`thenApplyAsync(Function<? super T, ? extends U> fn, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, is executed using the supplied Executor, with this stage's result as the argument to the supplied function.
`<U, V> CompletableFuture<V>`	`thenCombine(CompletionStage<? extends U> other, BiFunction<? super T, ? super U, ? extends V> fn)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed with the two results as arguments to the supplied function.
`<U, V> CompletableFuture<V>`	`thenCombineAsync(CompletionStage<? extends U> other, BiFunction<? super T, ? super U, ? extends V> fn, Executor executor)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using the supplied executor, with the two results as arguments to the supplied function.
`<U, V> CompletableFuture<V>`	`thenCombineAsync(CompletionStage<? extends U> other, BiFunction<? super T, ? super U, ? extends V> fn)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied function.
`<U> CompletableFuture<U>`	`thenCompose(Function<? super T, ? extends CompletionStage<U>> fn)` Returns a new CompletionStage that is completed with the same value as the CompletionStage returned by the given function.
`<U> CompletableFuture<U>`	`thenComposeAsync(Function<? super T, ? extends CompletionStage<U>> fn, Executor executor)` Returns a new CompletionStage that is completed with the same value as the CompletionStage returned by the given function, executed using the supplied Executor.
`<U> CompletableFuture<U>`	`thenComposeAsync(Function<? super T, ? extends CompletionStage<U>> fn)` Returns a new CompletionStage that is completed with the same value as the CompletionStage returned by the given function, executed using this stage's default asynchronous execution facility.
`CompletableFuture<Void>`	`thenRun(Runnable action)` Returns a new CompletionStage that, when this stage completes normally, executes the given action.
`CompletableFuture<Void>`	`thenRunAsync(Runnable action, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, executes the given action using the supplied Executor.
`CompletableFuture<Void>`	`thenRunAsync(Runnable action)` Returns a new CompletionStage that, when this stage completes normally, executes the given action using this stage's default asynchronous execution facility.
`CompletableFuture<T>`	`toCompletableFuture()` Returns this CompletableFuture.
`String`	`toString()` Returns a string identifying this CompletableFuture, as well as its completion state.
`CompletableFuture<T>`	`whenComplete(BiConsumer<? super T, ? super Throwable> action)` Returns a new CompletionStage with the same result or exception as this stage, that executes the given action when this stage completes.
`CompletableFuture<T>`	`whenCompleteAsync(BiConsumer<? super T, ? super Throwable> action)` Returns a new CompletionStage with the same result or exception as this stage, that executes the given action using this stage's default asynchronous execution facility when this stage completes.
`CompletableFuture<T>`	`whenCompleteAsync(BiConsumer<? super T, ? super Throwable> action, Executor executor)` Returns a new CompletionStage with the same result or exception as this stage, that executes the given action using the supplied Executor when this stage completes.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

From interface


  
    java.util.concurrent.Future

From interface


  
    java.util.concurrent.CompletionStage

`abstract CompletionStage<Void>`	`acceptEither(CompletionStage<? extends T> other, Consumer<? super T> action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed with the corresponding result as argument to the supplied action.
`abstract CompletionStage<Void>`	`acceptEitherAsync(CompletionStage<? extends T> other, Consumer<? super T> action, Executor executor)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using the supplied executor, with the corresponding result as argument to the supplied action.
`abstract CompletionStage<Void>`	`acceptEitherAsync(CompletionStage<? extends T> other, Consumer<? super T> action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the corresponding result as argument to the supplied action.
`abstract <U> CompletionStage<U>`	`applyToEither(CompletionStage<? extends T> other, Function<? super T, U> fn)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed with the corresponding result as argument to the supplied function.
`abstract <U> CompletionStage<U>`	`applyToEitherAsync(CompletionStage<? extends T> other, Function<? super T, U> fn, Executor executor)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using the supplied executor, with the corresponding result as argument to the supplied function.
`abstract <U> CompletionStage<U>`	`applyToEitherAsync(CompletionStage<? extends T> other, Function<? super T, U> fn)` Returns a new CompletionStage that, when either this or the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the corresponding result as argument to the supplied function.
`abstract CompletionStage<T>`	`exceptionally(Function<Throwable, ? extends T> fn)` Returns a new CompletionStage that, when this stage completes exceptionally, is executed with this stage's exception as the argument to the supplied function.
`abstract <U> CompletionStage<U>`	`handle(BiFunction<? super T, Throwable, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes either normally or exceptionally, is executed with this stage's result and exception as arguments to the supplied function.
`abstract <U> CompletionStage<U>`	`handleAsync(BiFunction<? super T, Throwable, ? extends U> fn, Executor executor)` Returns a new CompletionStage that, when this stage completes either normally or exceptionally, is executed using the supplied executor, with this stage's result and exception as arguments to the supplied function.
`abstract <U> CompletionStage<U>`	`handleAsync(BiFunction<? super T, Throwable, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes either normally or exceptionally, is executed using this stage's default asynchronous execution facility, with this stage's result and exception as arguments to the supplied function.
`abstract CompletionStage<Void>`	`runAfterBoth(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action.
`abstract CompletionStage<Void>`	`runAfterBothAsync(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action using this stage's default asynchronous execution facility.
`abstract CompletionStage<Void>`	`runAfterBothAsync(CompletionStage<?> other, Runnable action, Executor executor)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action using the supplied executor.
`abstract CompletionStage<Void>`	`runAfterEither(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action.
`abstract CompletionStage<Void>`	`runAfterEitherAsync(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action using this stage's default asynchronous execution facility.
`abstract CompletionStage<Void>`	`runAfterEitherAsync(CompletionStage<?> other, Runnable action, Executor executor)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action using the supplied executor.
`abstract CompletionStage<Void>`	`thenAccept(Consumer<? super T> action)` Returns a new CompletionStage that, when this stage completes normally, is executed with this stage's result as the argument to the supplied action.
`abstract CompletionStage<Void>`	`thenAcceptAsync(Consumer<? super T> action, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, is executed using the supplied Executor, with this stage's result as the argument to the supplied action.
`abstract CompletionStage<Void>`	`thenAcceptAsync(Consumer<? super T> action)` Returns a new CompletionStage that, when this stage completes normally, is executed using this stage's default asynchronous execution facility, with this stage's result as the argument to the supplied action.
`abstract <U> CompletionStage<Void>`	`thenAcceptBoth(CompletionStage<? extends U> other, BiConsumer<? super T, ? super U> action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed with the two results as arguments to the supplied action.
`abstract <U> CompletionStage<Void>`	`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T, ? super U> action, Executor executor)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using the supplied executor, with the two results as arguments to the supplied action.
`abstract <U> CompletionStage<Void>`	`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T, ? super U> action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied action.
`abstract <U> CompletionStage<U>`	`thenApply(Function<? super T, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes normally, is executed with this stage's result as the argument to the supplied function.
`abstract <U> CompletionStage<U>`	`thenApplyAsync(Function<? super T, ? extends U> fn)` Returns a new CompletionStage that, when this stage completes normally, is executed using this stage's default asynchronous execution facility, with this stage's result as the argument to the supplied function.
`abstract <U> CompletionStage<U>`	`thenApplyAsync(Function<? super T, ? extends U> fn, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, is executed using the supplied Executor, with this stage's result as the argument to the supplied function.
`abstract <U, V> CompletionStage<V>`	`thenCombine(CompletionStage<? extends U> other, BiFunction<? super T, ? super U, ? extends V> fn)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed with the two results as arguments to the supplied function.
`abstract <U, V> CompletionStage<V>`	`thenCombineAsync(CompletionStage<? extends U> other, BiFunction<? super T, ? super U, ? extends V> fn)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied function.
`abstract <U, V> CompletionStage<V>`	`thenCombineAsync(CompletionStage<? extends U> other, BiFunction<? super T, ? super U, ? extends V> fn, Executor executor)` Returns a new CompletionStage that, when this and the other given stage both complete normally, is executed using the supplied executor, with the two results as arguments to the supplied function.
`abstract <U> CompletionStage<U>`	`thenCompose(Function<? super T, ? extends CompletionStage<U>> fn)` Returns a new CompletionStage that is completed with the same value as the CompletionStage returned by the given function.
`abstract <U> CompletionStage<U>`	`thenComposeAsync(Function<? super T, ? extends CompletionStage<U>> fn, Executor executor)` Returns a new CompletionStage that is completed with the same value as the CompletionStage returned by the given function, executed using the supplied Executor.
`abstract <U> CompletionStage<U>`	`thenComposeAsync(Function<? super T, ? extends CompletionStage<U>> fn)` Returns a new CompletionStage that is completed with the same value as the CompletionStage returned by the given function, executed using this stage's default asynchronous execution facility.
`abstract CompletionStage<Void>`	`thenRun(Runnable action)` Returns a new CompletionStage that, when this stage completes normally, executes the given action.
`abstract CompletionStage<Void>`	`thenRunAsync(Runnable action, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, executes the given action using the supplied Executor.
`abstract CompletionStage<Void>`	`thenRunAsync(Runnable action)` Returns a new CompletionStage that, when this stage completes normally, executes the given action using this stage's default asynchronous execution facility.
`abstract CompletableFuture<T>`	`toCompletableFuture()` Returns a `CompletableFuture` maintaining the same completion properties as this stage.
`abstract CompletionStage<T>`	`whenComplete(BiConsumer<? super T, ? super Throwable> action)` Returns a new CompletionStage with the same result or exception as this stage, that executes the given action when this stage completes.
`abstract CompletionStage<T>`	`whenCompleteAsync(BiConsumer<? super T, ? super Throwable> action)` Returns a new CompletionStage with the same result or exception as this stage, that executes the given action using this stage's default asynchronous execution facility when this stage completes.
`abstract CompletionStage<T>`	`whenCompleteAsync(BiConsumer<? super T, ? super Throwable> action, Executor executor)` Returns a new CompletionStage with the same result or exception as this stage, that executes the given action using the supplied Executor when this stage completes.

Parameters
`other`	`CompletionStage`: the other CompletionStage
`action`	`Consumer`: the action to perform before completing the returned CompletionStage

Parameters
`other`	`CompletionStage`: the other CompletionStage
`fn`	`Function`: the function to use to compute the value of the returned CompletionStage

Parameters
`timeout`	`long`: the maximum time to wait
`unit`	`TimeUnit`: the time unit of the timeout argument

Throws
`CancellationException`	if this future was cancelled
`ExecutionException`	if this future completed exceptionally
`InterruptedException`	if the current thread was interrupted while waiting
`TimeoutException`	if the wait timed out

Throws
`CancellationException`	if the computation was cancelled
`CompletionException`	if this future completed exceptionally or a completion computation threw an exception

Parameters
`fn`	`BiFunction`: the function to use to compute the value of the returned CompletionStage
`executor`	`Executor`: the executor to use for asynchronous execution

Parameters
`runnable`	`Runnable`: the action to run before completing the returned CompletableFuture
`executor`	`Executor`: the executor to use for asynchronous execution

Parameters
`supplier`	`Supplier`: a function returning the value to be used to complete the returned CompletableFuture
`executor`	`Executor`: the executor to use for asynchronous execution

Parameters
`action`	`Runnable`: the action to perform before completing the returned CompletionStage
`executor`	`Executor`: the executor to use for asynchronous execution

Parameters
`action`	`BiConsumer`: the action to perform
`executor`	`Executor`: the executor to use for asynchronous execution

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