Java深入学习13：Java线程池

        //创建缓存线程池，线程数量不固定，可以自动调节线程数量
        ExecutorService executor1 = Executors.newCachedThreadPool();
        //创建缓存线程池，并且只有一个线程数量
        ExecutorService executor2 = Executors.newSingleThreadExecutor();
        //创建缓存线程池，并指定线程数量
        ExecutorService executor3 = Executors.newFixedThreadPool(5);

public class ThreadPoolTest {

    public static void main(String[] args) throws ExecutionException, InterruptedException {

        //创建线程池
        ExecutorService executor = Executors.newFixedThreadPool(5);

        //方法1：Future<?> submit(Runnable task);
        executor.submit(new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName() + " runnable");
            }
        });
        //方法2：<T> Future<T> submit(Callable<T> task);
        Future<Object> future = executor.submit(new Callable<Object>() {
            @Override
            public Object call() throws Exception {
                System.out.println(Thread.currentThread().getName() + " callable");
                return new Random().nextInt(100);
            }
        });
        System.out.println(future.get());

        //关闭线程池。ExecutorService
        executor.shutdown();
    }

}

public class ThreadPoolTest {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //1-创建线程池
        ScheduledExecutorService scheduledExecutor = Executors.newScheduledThreadPool(5);
        //2-执行线程，延迟2秒执行
        for(int i=0; i<10; i++){
            scheduledExecutor.schedule(new Runnable() {
                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName());
                }
            },2,TimeUnit.SECONDS );
        }
        //3-关闭线程池
        scheduledExecutor.shutdown();
    }
}
------------------------------日志输出------------------------------
pool-1-thread-1
pool-1-thread-1
pool-1-thread-1
pool-1-thread-1
pool-1-thread-3
pool-1-thread-3
pool-1-thread-5
pool-1-thread-2
pool-1-thread-4
pool-1-thread-1

//日志说明：线程只有5个，并且会重复使用