public class Executor {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ThreadPoolExecutor executor = new ThreadPoolExecutor(5, 10, 12,
                TimeUnit.SECONDS, new ArrayBlockingQueue<>(5), new ThreadPoolExecutor.CallerRunsPolicy());

        Map paramMap
 
=new HashMap();
        
        //在進行條件初始化時（format時）可以使用執行緒池
        //初始化條件1
        CompletableFuture<Void> future1 = CompletableFuture.runAsync(() -> {
            paramMap.put("p1","你若執行完了等我");
        }, executor);

        //初始化條件2
        CompletableFuture<Void> future2 = CompletableFuture.runAsync(() -> {
            paramMap.put(
 
"p2","你若執行完了等我");
        }, executor);

        //讓兩個執行緒都等各自執行完畢
        CompletableFuture<Void> allFutureWait = CompletableFuture.allOf(future1, future2);
        Void unused = allFutureWait.get();

        System.out.println("paramMap="+paramMap);
    }
}