两个方法都可以向线程池提交任务,execute()方法的返回类型是void,它定义在Executor接口中,而submit()方法返回有计算结构的Future对象,它定义在ExecutorService接口中,它拓展了Executor接口,其他线程池类像ThreadPoolExecutor和ScheduledThreadPoolExecutor都有这些方法。
submit()
public static void submit() throws ExecutionException, InterruptedException { ExecutorService executorService = Executors.newFixedThreadPool(3); Callable callable = () -> { Thread.sleep(4000); return "我是结果!"; }; Future future = executorService.submit(callable); //关闭连接池 executorService.shutdown(); //同步获取结果 String str = future.get().toString(); System.out.println("str:" + str); }
execute()
public static void execute(){ ExecutorService executorService = Executors.newFixedThreadPool(3); Runnable runnable = () -> { System.out.println("hello runnable!"); }; executorService.execute(runnable); //关闭连接池 executorService.shutdown(); }