CompletableFuture源码详解之java.util.concurrent.CompletableFuture#runAsync(java.lang.Runnable)

　　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.util.concurrent.CompletableFuture;
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：