Asynchronous or thread pool

public class ThreadTest {
    

    public static ExecutorService executor = Executors.newFixedThreadPool(10);

    public static void main(String[] args) throws ExecutionException, InterruptedException {
    
        // System.out.println("main......start.....");
        // Thread thread = new Thread01();
        // thread.start();
        // System.out.println("main......end.....");

        // Runable01 runable01 = new Runable01();
        // new Thread(runable01).start();

        // FutureTask<Integer> futureTask = new FutureTask<>(new Callable01());
        // new Thread(futureTask).start();
        // System.out.println(futureTask.get());

        // service.execute(new Runable01());
        // Future<Integer> submit = service.submit(new Callable01());
        // submit.get();

        System.out.println("main......start.....");
        // CompletableFuture<Void> future = CompletableFuture.runAsync(() -> {
    
        // System.out.println(" Current thread ：" + Thread.currentThread().getId());
        // int i = 10 / 2;
        // System.out.println(" Running results ：" + i);
        // }, executor);

        /** *  Treatment after the completion of the method  */
        // CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
    
        // System.out.println(" Current thread ：" + Thread.currentThread().getId());
        // int i = 10 / 0;
        // System.out.println(" Running results ：" + i);
        // return i;
        // }, executor).whenComplete((res,exception) -> {
    
        // // Although you can get abnormal information , But you can't modify the returned data 
        // System.out.println(" The asynchronous task completed successfully ... The result is ：" + res + " Exception is ：" + exception);
        // }).exceptionally(throwable -> {
    
        // // Can sense exceptions , At the same time, return the default value 
        // return 10;
        // });

        /** *  Method performs back-end processing  */
        // CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
    
        // System.out.println(" Current thread ：" + Thread.currentThread().getId());
        // int i = 10 / 2;
        // System.out.println(" Running results ：" + i);
        // return i;
        // }, executor).handle((result,thr) -> {
    
        // if (result != null) {
    
        // return result * 2;
        // }
        // if (thr != null) {
    
        // System.out.println(" The asynchronous task completed successfully ... The result is ：" + result + " Exception is ：" + thr);
        // return 0;
        // }
        // return 0;
        // });


        /** *  Thread serialization  * 1、thenRunL： Unable to get the execution result of the previous step  * 2、thenAcceptAsync： I can accept the result , But no return value  * 3、thenApplyAsync： I can accept the result , There is a return value  * */
        CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
    
            System.out.println(" Current thread ：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println(" Running results ：" + i);
            return i;
        }, executor).thenApplyAsync(res -> {
    
            System.out.println(" Mission 2 Launched the ..." + res);
            return "Hello" + res;
        }, executor);
        System.out.println("main......end....." + future.get());

    }

    private static void threadPool() {
    

        ExecutorService threadPool = new ThreadPoolExecutor(
                200,
                10,
                10L,
                TimeUnit.SECONDS,
                new LinkedBlockingDeque<Runnable>(10000),
                Executors.defaultThreadFactory(),
                new ThreadPoolExecutor.AbortPolicy()
        );

        // Thread pool for scheduled tasks 
        ExecutorService service = Executors.newScheduledThreadPool(2);
    }


    public static class Thread01 extends Thread {
    
        @Override
        public void run() {
    
            System.out.println(" Current thread ：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println(" Running results ：" + i);
        }
    }


    public static class Runable01 implements Runnable {
    
        @Override
        public void run() {
    
            System.out.println(" Current thread ：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println(" Running results ：" + i);
        }
    }


    public static class Callable01 implements Callable<Integer> {
    
        @Override
        public Integer call() throws Exception {
    
            System.out.println(" Current thread ：" + Thread.currentThread().getId());
            int i = 10 / 2;
            System.out.println(" Running results ：" + i);
            return i;
        }
    }

}