CompletableFuture Java example Here is another example with method calls and a bit more complex than the simple examples we have seen till now. In the example first method fetches the list of users, in the second method user names are changed to upper case. modified list is then returned. ...
importjava.util.concurrent.CompletableFuture; importjava.util.concurrent.Executor; importjava.util.concurrent.Executors; publicclassMain { publicstaticvoidmain(String[] args) { // Example 1: Simple CompletableFuture CompletableFuture<String> future = CompletableFuture.supplyAsync(() ->"Hello") .thenApply...
Now that the functionality of CompletionStage and specifically CompletableFuture is explored, the below example applies them in a practical scenario: 现在你已经了解了CompletionStage 和 CompletableFuture 的一些函数的功能,下面的例子是一个实践场景: 首先异步调用cars方法获得Car的列表,它返回CompletionStage场景。ca...
importjava.util.concurrent.CompletableFuture;publicclassCompletableFutureExceptionExample{publicstaticvoidmain(String[]args){CompletableFuture<Integer>future=CompletableFuture.supplyAsync(()->{thrownewRuntimeException("Exception in CompletableFuture");});future.exceptionally(ex->{System.out.println("Exception occ...
对于Java 程序来说,Java 8 才被引入的 CompletableFuture 可以帮助我们来做多个任务的编排,功能非常强大。 一、 Future Future 类是异步思想的典型运用,主要用在一些需要执行耗时任务的场景,避免程序一直原地等待耗时任务执行完成,执行效率太低。 在Java 中,Future 类只是一个泛型接口,位于 java.util.concurrent 包下...
Java 8 CompletableFuture 教程 Java 8 有大量的新特性和增强如Lambda 表达式,Streams,CompletableFuture等。在本篇文章中我将详细解释清楚CompletableFuture以及它所有方法的使用。 什么是CompletableFuture? 在Java中CompletableFuture用于异步编程,异步编程是编写非阻塞的代码,运行的任务在一个单独的线程,与主线程隔离,并且...
java复制代码 代码语言:javascript 代码运行次数:0 importjava.util.concurrent.CompletableFuture;importjava.util.concurrent.ExecutionException;publicclassCompletableFutureExample{publicstaticvoidmain(String[]args)throws ExecutionException,InterruptedException{// 使用默认的执行器异步执行任务CompletableFuture future=Completab...
This post revisits Java 8's CompletionStage API and specifically its implementation in the standard Java library, CompletableFuture. The API is explained by examples that illustrate the various behaviors, where each example focuses on a specific one or t
A simple example: CompletableFuture<Integer>future=CompletableFuture.supplyAsync(this::computeEndlessly).orTimeout(1,TimeUnit.SECONDS);future.get();// java.util.concurrent.ExecutionException after waiting for 1 second CompletableFuture#completeOnTimeout ...
In the above example, the anyOfFuture is completed when any of the three CompletableFutures complete. Since future2 has the least amount of sleep time, it will complete first, and the final result will be - Result of Future 2. CompletableFuture.anyOf() takes a varargs of Futures and ret...