12、Java并发编程：CompletableFuture异步回调

package completable;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

public class CompletableFutureDemo {

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //异步调用，没有返回值
        CompletableFuture<Void> completableFuture1 = CompletableFuture.runAsync(()->{
            System.out.println(Thread.currentThread().getName()+"completableFuture1");
        });
        completableFuture1.get();

        //异步调用，有返回值
        CompletableFuture<Integer> completableFuture2 = CompletableFuture.supplyAsync(()->{
            System.out.println(Thread.currentThread().getName()+"completableFuture1");
            return 1024;
        });
        completableFuture2.whenComplete((t, u)->{
            System.out.println("----t="+t);  //返回值
            System.out.println("----u="+u);  //异常
        }).get();
    }
}

总结来说，就是用CompleTableFuture类的runAsync和supplyAsync方法。