Explanation
1. The CompletableFuture class was introduced in JDK 8 and implemented the Future and CompletionStage interfaces.
Provides a series of methods for asynchronous programming, such as supplyAsync , runAsync and thenApplyAsync, etc.
2. The function allows two or more to perform operations to produce results.
Example
/** * @author mghio * @since 2021-08-01 */ public class CompletableFutureDemo { public static CompletableFuture<String> doOneThing() { return CompletableFuture.supplyAsync(() -> { try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } return "doOneThing"; }); } public static CompletableFuture<String> doOtherThing(String parameter) { return CompletableFuture.supplyAsync(() -> { try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } return parameter + " " + "doOtherThing"; }); } public static void main(String[] args) throws ExecutionException, InterruptedException { StopWatch stopWatch = new StopWatch("CompletableFutureDemo"); stopWatch.start(); // 异步执行版本 testCompletableFuture(); stopWatch.stop(); System.out.println(stopWatch); } private static void testCompletableFuture() throws InterruptedException, ExecutionException { // 先执行 doOneThing 任务,后执行 doOtherThing 任务 CompletableFuture<String> resultFuture = doOneThing().thenCompose(CompletableFutureDemo::doOtherThing); // 获取任务结果 String doOneThingResult = resultFuture.get(); // 获取执行结果 System.out.println("DoOneThing and DoOtherThing execute finished. result = " + doOneThingResult); } }
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