java需要关注的知识点---并发之从任务中产生返回值

class TaskWithResult implements Callable<String>{
	private int id;
	
	public int getId() {
		return id;
	}

	public TaskWithResult(int id) {
		super();
		this.id = id;
	}

	public void setId(int id) {
		this.id = id;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
	}

	@Override
	public String call() throws Exception {
		
		return "result of TaskWithResult :" + id; 
	}

}

public class CallableDemo {
	public static void main(String[] args) {
		ExecutorService es = Executors.newCachedThreadPool();
		ArrayList<Future<String>> results = new ArrayList<Future<String>>();
		for (int i = 0; i < 10; i++)
			results.add(es.submit(new TaskWithResult(i)));
			try {
				for (Future<String> fs : results){
				//调用get方法获取线程执行后的结果
				System.out.println("result:===>" + fs.get());
				// 调用isDone查看任务是否完成
				System.out.println("done:" + fs.isDone());
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			} catch (ExecutionException e) {
				e.printStackTrace();
			}finally {
				System.out.println("1");
				es.shutdown();
			}
			System.out.println("2");
			
	}
}