浅谈线程runnable和callable的使用及区别

public class TestThread {

    private static int nThreads = Runtime.getRuntime().availableProcessors() * 2 + 1;

    private static ExecutorService executors = Executors.newFixedThreadPool(nThreads, new ThreadFactory() {

        private final String threadNamePrefix = "si_query_task_";

        private final AtomicInteger count = new AtomicInteger(1);

        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(Thread.currentThread().getThreadGroup(), r, threadNamePrefix + count.getAndIncrement());
            t.setDaemon(true);
            return t;
        }
    });

    public static void main(String[] args) {

        List<Future<String[]>> fList = new ArrayList<>();

        for (int i = 0; i < 10; i++) {
            final int nextInt = new Random().nextInt(100);
            Future<String[]> f = executors.submit(new TestTaskcb(nextInt));
            fList.add(f);
        }

        for (Future<String[]> future : fList) {
            try {
                String[] result = future.get();
               // System.out.println(result[0] + " , 结果   " + result[1]);
            } catch (InterruptedException e) {
            } catch (ExecutionException e) {
            }
        }
        System.out.println("call线程结束");
        
        for (int i = 0; i < 10; i++) {
            final int nextInt = new Random().nextInt(100);
            executors.execute(new TestTaskvoid(nextInt));
        }
        System.out.println("void线程结束");
        
        System.out.println("main 线程结束 ");

    }

    static class TestTaskcb implements Callable<String[]> {

        private int i;

        public TestTaskcb(int i) {
            this.i = i;
        }

        @Override
        public String[] call() throws Exception {
            String result = i % 2 == 0 ? "S" : "F";
            // 业务处理逻辑
            //Thread.sleep(1000);
            System.out.println(Thread.currentThread().getName() + "第" + i + "次任务");
            return new String[]{ Thread.currentThread().getName(), result };
        }
    }
    
    static class TestTaskvoid implements Runnable {

        private int i;

        public TestTaskvoid(int i) {
            this.i = i;
        }

        @Override
        public void run() {
            System.out.println(Thread.currentThread().getName() + "第" + i + "次任务");
        }
    }
}