65、商城业务---异步---CompletableFuture完成回调与异常感知

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

public class ThreadTest {
    public static ExecutorService service = Executors.newFixedThreadPool(5);
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        System.out.println("main-----start");

//        CompletableFuture.runAsync(()->{
//            System.out.println("当前线程：：" + Thread.currentThread().getId());
//            int i = 10/2;
//            System.out.println("运行结果：：" + i);
//        }, service);

        CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
            System.out.println("当前线程：：" + Thread.currentThread().getId());
            int i = 10/0;
            System.out.println("运行结果：：" + i);

            return i;
        }, service).whenComplete((result, exception)->{
            /**
             * 虽然能得到异常信息，但是没有返回值，也就没法修改返回数据
             */
            System.out.println("结果是：：" + result);
            System.out.println("异常是：：" + exception);
        }).exceptionally(throwable -> {
            /**
             * 可以修改返回数据
             */
            System.out.println("异常是：：" + throwable);
            return 10;
        });

        System.out.println("main-----end--" + future.get());
    }
}