java线程的一段代码

public static void main(String[] args) throws Exception {
	ExecutorService threadpool = Executors.newFixedThreadPool(1);
	Callable r = new Callable() {
		@Override
		public String call() {
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			return "11111";
		}
	};
	FutureTask<String> f = new FutureTask<>(r);
	new Thread(f).start();
	System.out.println(f.get());
	System.out.println("end");
	
	Runnable r = new Runnable() {
		@Override
		public void run() {
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("runnable");
		}
	};
	
	Thread t = new Thread(r);
	t.start();
	LockSupport.unpark(t);
	System.out.println("hhh");
}