CompletableFuture#runAsync方法是用来执行无返回结果的异步程序，当执行一大堆业务逻辑代码，而又不需要返回结果的时候，可以使用此方法异步执行，提升接口性能，方法源码如下：
/*** Returns a new CompletableFuture that is asynchronously completed* by a task running in the {@link ForkJoinPool#commonPool()} after* it runs the given action.** @param runnable the action to run before completing the* returned CompletableFuture* @return the new CompletableFuture*/public static CompletableFuture<Void> runAsync(Runnable runnable) {return asyncRunStage(asyncPool, runnable);}
源码所示，任务使用的是ForkJoinPool#commonPool()线程池执行，后续会写这块的内容，具体使用实例如下：
import java.pletableFuture;import java.util.concurrent.ExecutionException;/*** 测试类* @author yangchangkui*/public class TestMy {public static void main(String[] args) throws ExecutionException, InterruptedException {long start = System.currentTimeMillis();CompletableFuture<Void> voidCompletableFuture = CompletableFuture.runAsync(() -> {try {//do something ...Thread.sleep(300);} catch (InterruptedException e) {e.printStackTrace();}});//判断是否已经完成System.out.println("耗时1："+(System.currentTimeMillis()-start)+"，isDone:"+voidCompletableFuture.isDone());//do something ...Thread.sleep(300);//判断是否已经完成System.out.println("耗时2："+(System.currentTimeMillis()-start)+"，isDone:"+voidCompletableFuture.isDone());}}
执行结果如下图：
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