java8線程池

       //java8線程池


        ExecutorService pool = Executors.newFixedThreadPool(4);

        Callable a = ()->{return findA();};
        Callable b = ()->{return findB();};
        Callable c = ()->{return findC();};
        Callable d = ()->{return findD();};
        FutureTask<List> fa = new FutureTask<List>(a);
        FutureTask<List> fb = new FutureTask<List>(b);
        FutureTask<List> fc = new FutureTask<List>(c);
        FutureTask<List> fd = new FutureTask<List>(d);
        Thread t1 = new Thread(fa);
        Thread t2 = new Thread(fb);
        Thread t3 = new Thread(fc);
        Thread t4 = new Thread(fd);
        pool.execute(t1);
        pool.execute(t2);
        pool.execute(t3);
        pool.execute(t4);
        pool.shutdown();
       
        map.put("a",fa.get());
        map.put("b",fb.get());
        map.put("c",fc.get());
        map.put("d",fd.get());
        return map;