解读线程池中submit()和execute()区别与联系

ExecutorService threadPool = Executors.newFixedThreadPool(2);
    
threadPool.execute(()->{
    System.out.println("hello execute");
});

​
executor.execute(() -> {
    throw new RuntimeException("Error in execute()");
});
// 调用者无法捕获此异常

​

<T> Future<T> submit(Callable<T> task);
Future<?> submit(Runnable task);
<T> Future<T> submit(Runnable task, T result);

     Future<?> submit = threadPool.submit(() -> {
            System.out.println("hello submit1");
        });

        try {
            submit.get();
        } catch (Exception e) {
            e.printStackTrace();
        }

        Future<String> submit1 = threadPool.submit(() -> {
            System.out.println("hello submit2");

        }, "submit");

        try {
            String object = (String) submit1.get();
            System.out.println("object=="+object);
        } catch (Exception e) {
            e.printStackTrace();
        }

        Future<Integer> submit2 = threadPool.submit(() -> {
            return 1;
        });

        try {
            Integer integer = submit2.get();
            System.out.println("integer=="+integer);
        } catch (Exception e) {
            e.printStackTrace();
        }

Future<?> future = executor.submit(() -> {
    throw new RuntimeException("Error in submit()");
});

try {
    future.get(); // 会抛出 ExecutionException
} catch (ExecutionException e) {
    System.out.println("Caught exception: " + e.getCause().getMessage());
}