public class CallableExample implements Callable<Integer> {

	private Integer num = 100;

	@Override
	public Integer call() throws Exception {
		for (int i = 0; i < num; i++) {
			num--;
			System.out.println(Thread.currentThread().getName() + ":" + num);
		}
		return num;
	}

}

public class CallableExampleTest {

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

		Callable<Integer> callable = new CallableExample();
		FutureTask<Integer> target1 = new FutureTask<>(callable);
		FutureTask<Integer> target2 = new FutureTask<>(callable);
		Thread thread1 = new Thread(target1, "子執行緒1");
		thread1.start();
		Thread thread2 = new Thread(target2, "子執行緒2");
		thread2.start();
		System.out.println("子執行緒1--call方法返回值:" + target1.get());
		System.out.println("子執行緒2--call方法返回值:" + target2.get());

	}

}