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...
CompletableFuture是java8引入的一个异步类,它最大的优势是可以在创建的对象中传入一个回调对象,在任务结束后(done或throw exception),自动调用回调对象的回调方法,而不用让主线程阻塞...方法返回的是Object对象而不是Void,这是跟allOf的一个很大的区别,我们要配置异
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=CompletableFuture.runAs...
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 ...
staticvoid completedFutureExample() { CompletableFuture cf = CompletableFuture.completedFuture("message"); assertTrue(cf.isDone()); assertEquals("message", cf.getNow(null)); } getNow(null)方法在future完成的情况下会返回结果,就比如上面这个例子,否则返回null (传入的参数)。
非强制的取消任务机制,调用 cancel 方法,若任务处于 NEW 状态,可以保证取消;若任务处于运行状态,需要依赖于任务支持中断机制,Java 的中断机制是设立标志位,无法直接传输数据。 booleancancel(booleanmayInterruptIfRunning); Future 接口不支持回调以及链式调用,CompletableFuture 实现了此功能,但是自身也有一些问题。
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
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...
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...
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...