## Uses of Interface
java.util.concurrent.CompletionStage

- Packages that use CompletionStage
  Package | Description
  --- | ---
  java.util.concurrent | Utility classes commonly useful in concurrent programming.

- - ### Uses of CompletionStage in java.util.concurrent

    Classes in java.util.concurrent that implement CompletionStage
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `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.

    Methods in java.util.concurrent that return CompletionStage
    Modifier and Type | Method | Description
    --- | --- | ---
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`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 function.
    `<U> CompletionStage<U>` | CompletionStage.`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> CompletionStage<U>` | CompletionStage.`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> CompletionStage<U>` | CompletionStage.`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.
    `CompletionStage<T>` | CompletionStage.`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.
    `<U> CompletionStage<U>` | CompletionStage.`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> CompletionStage<U>` | CompletionStage.`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.
    `<U> CompletionStage<U>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`runAfterBoth(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage both complete normally, executes the given action.
    `CompletionStage<Void>` | CompletionStage.`runAfterBothAsync(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage complete normally, executes the given action using this stage's default asynchronous execution facility.
    `CompletionStage<Void>` | CompletionStage.`runAfterBothAsync(CompletionStage<?> other, Runnable action, Executor executor)` Returns a new CompletionStage that, when this and the other given stage complete normally, executes the given action using the supplied executor.
    `CompletionStage<Void>` | CompletionStage.`runAfterEither(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action.
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`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.
    `<U> CompletionStage<Void>` | CompletionStage.`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> CompletionStage<Void>` | CompletionStage.`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T,? super U> action)` Returns a new CompletionStage that, when this and the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied action.
    `<U> CompletionStage<Void>` | CompletionStage.`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 complete normally, is executed using the supplied executor, with the two results as arguments to the supplied function.
    `<U> CompletionStage<U>` | CompletionStage.`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> CompletionStage<U>` | CompletionStage.`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> CompletionStage<U>` | CompletionStage.`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> CompletionStage<V>` | CompletionStage.`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> CompletionStage<V>` | CompletionStage.`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 complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied function.
    `<U,V> CompletionStage<V>` | CompletionStage.`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 complete normally, is executed using the supplied executor, with the two results as arguments to the supplied function.
    `<U> CompletionStage<U>` | CompletionStage.`thenCompose(Function<? super T,? extends CompletionStage<U>> fn)` Returns a new CompletionStage that, when this stage completes normally, is executed with this stage as the argument to the supplied function.
    `<U> CompletionStage<U>` | CompletionStage.`thenComposeAsync(Function<? super T,? extends CompletionStage<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 as the argument to the supplied function.
    `<U> CompletionStage<U>` | CompletionStage.`thenComposeAsync(Function<? super T,? extends CompletionStage<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.
    `CompletionStage<Void>` | CompletionStage.`thenRun(Runnable action)` Returns a new CompletionStage that, when this stage completes normally, executes the given action.
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletionStage<Void>` | CompletionStage.`thenRunAsync(Runnable action, Executor executor)` Returns a new CompletionStage that, when this stage completes normally, executes the given action using the supplied Executor.
    `CompletionStage<T>` | CompletionStage.`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.
    `CompletionStage<T>` | CompletionStage.`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.
    `CompletionStage<T>` | CompletionStage.`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.

    Methods in java.util.concurrent with parameters of type CompletionStage
    Modifier and Type | Method | Description
    --- | --- | ---
    `CompletableFuture<Void>` | CompletableFuture.`acceptEither(CompletionStage<? extends T> other, Consumer<? super T> action)`
    `CompletionStage<Void>` | CompletionStage.`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>` | CompletableFuture.`acceptEitherAsync(CompletionStage<? extends T> other, Consumer<? super T> action)`
    `CompletionStage<Void>` | CompletionStage.`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>` | CompletableFuture.`acceptEitherAsync(CompletionStage<? extends T> other, Consumer<? super T> action, Executor executor)`
    `CompletionStage<Void>` | CompletionStage.`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 function.
    `<U> CompletableFuture<U>` | CompletableFuture.`applyToEither(CompletionStage<? extends T> other, Function<? super T,U> fn)`
    `<U> CompletionStage<U>` | CompletionStage.`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>` | CompletableFuture.`applyToEitherAsync(CompletionStage<? extends T> other, Function<? super T,U> fn)`
    `<U> CompletionStage<U>` | CompletionStage.`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>` | CompletableFuture.`applyToEitherAsync(CompletionStage<? extends T> other, Function<? super T,U> fn, Executor executor)`
    `<U> CompletionStage<U>` | CompletionStage.`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.
    `CompletableFuture<Void>` | CompletableFuture.`runAfterBoth(CompletionStage<?> other, Runnable action)`
    `CompletionStage<Void>` | CompletionStage.`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>` | CompletableFuture.`runAfterBothAsync(CompletionStage<?> other, Runnable action)`
    `CompletionStage<Void>` | CompletionStage.`runAfterBothAsync(CompletionStage<?> other, Runnable action)` Returns a new CompletionStage that, when this and the other given stage complete normally, executes the given action using this stage's default asynchronous execution facility.
    `CompletableFuture<Void>` | CompletableFuture.`runAfterBothAsync(CompletionStage<?> other, Runnable action, Executor executor)`
    `CompletionStage<Void>` | CompletionStage.`runAfterBothAsync(CompletionStage<?> other, Runnable action, Executor executor)` Returns a new CompletionStage that, when this and the other given stage complete normally, executes the given action using the supplied executor.
    `CompletableFuture<Void>` | CompletableFuture.`runAfterEither(CompletionStage<?> other, Runnable action)`
    `CompletionStage<Void>` | CompletionStage.`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>` | CompletableFuture.`runAfterEitherAsync(CompletionStage<?> other, Runnable action)`
    `CompletionStage<Void>` | CompletionStage.`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.
    `CompletableFuture<Void>` | CompletableFuture.`runAfterEitherAsync(CompletionStage<?> other, Runnable action, Executor executor)`
    `CompletionStage<Void>` | CompletionStage.`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.
    `<U> CompletableFuture<Void>` | CompletableFuture.`thenAcceptBoth(CompletionStage<? extends U> other, BiConsumer<? super T,? super U> action)`
    `<U> CompletionStage<Void>` | CompletionStage.`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>` | CompletableFuture.`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T,? super U> action)`
    `<U> CompletionStage<Void>` | CompletionStage.`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T,? super U> action)` Returns a new CompletionStage that, when this and the other given stage complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied action.
    `<U> CompletableFuture<Void>` | CompletableFuture.`thenAcceptBothAsync(CompletionStage<? extends U> other, BiConsumer<? super T,? super U> action, Executor executor)`
    `<U> CompletionStage<Void>` | CompletionStage.`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 complete normally, is executed using the supplied executor, with the two results as arguments to the supplied function.
    `<U,V> CompletableFuture<V>` | CompletableFuture.`thenCombine(CompletionStage<? extends U> other, BiFunction<? super T,? super U,? extends V> fn)`
    `<U,V> CompletionStage<V>` | CompletionStage.`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>` | CompletableFuture.`thenCombineAsync(CompletionStage<? extends U> other, BiFunction<? super T,? super U,? extends V> fn)`
    `<U,V> CompletionStage<V>` | CompletionStage.`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 complete normally, is executed using this stage's default asynchronous execution facility, with the two results as arguments to the supplied function.
    `<U,V> CompletableFuture<V>` | CompletableFuture.`thenCombineAsync(CompletionStage<? extends U> other, BiFunction<? super T,? super U,? extends V> fn, Executor executor)`
    `<U,V> CompletionStage<V>` | CompletionStage.`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 complete normally, is executed using the supplied executor, with the two results as arguments to the supplied function.

    Method parameters in java.util.concurrent with type arguments of type CompletionStage
    Modifier and Type | Method | Description
    --- | --- | ---
    `<U> CompletableFuture<U>` | CompletableFuture.`thenCompose(Function<? super T,? extends CompletionStage<U>> fn)`
    `<U> CompletionStage<U>` | CompletionStage.`thenCompose(Function<? super T,? extends CompletionStage<U>> fn)` Returns a new CompletionStage that, when this stage completes normally, is executed with this stage as the argument to the supplied function.
    `<U> CompletableFuture<U>` | CompletableFuture.`thenComposeAsync(Function<? super T,? extends CompletionStage<U>> fn)`
    `<U> CompletionStage<U>` | CompletionStage.`thenComposeAsync(Function<? super T,? extends CompletionStage<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 as the argument to the supplied function.
    `<U> CompletableFuture<U>` | CompletableFuture.`thenComposeAsync(Function<? super T,? extends CompletionStage<U>> fn, Executor executor)`
    `<U> CompletionStage<U>` | CompletionStage.`thenComposeAsync(Function<? super T,? extends CompletionStage<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.

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2026, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.