开启9个线程执行任务，但是同时只能有3个线程处于可运行状态，其余的暂时处于阻塞状态

开启了9个线程分别取去执行任务，但同时只能有3个线程处于运行中，其余的处于block状态，等某个线程运行完后，再将block状态的线程唤醒去执行，直到所有的任务执行完成，这样做的一个原因是当系统中有大量线程，比如有10000个线程在运行时，CPU在线程之间切换可能导致效率很低，我只让有限的线程比如10个线程运行，减少线程间切换，可以提高效率。要求不使用线程池实现

public class Test {
    //CONTROLS锁
    final static private LinkedList<Control> CONTROLS = new LinkedList<>();
    private final static int MAX_WORKER = 2;

    public static void main(String[] args) {

        List<Thread> worker = new ArrayList<>();
        Arrays.asList("T1", "T2", "T3", "T4", "T5", "T6", "T7", "T8", "T9").stream()
                .map(Test::createCaptureThread).forEach(t -> {
                    t.start();
                    worker.add(t);
                });

        worker.stream().forEach(t -> {
            try {
                t.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        System.out.println("All of capture work finished");
    }

    private static Thread createCaptureThread(String name) {
        return new Thread(() -> {
            System.out.println("The worker 【" + Thread.currentThread().getName() + " 】 BEGIN capture data ");
            synchronized (CONTROLS) {
                while (CONTROLS.size() >  MAX_WORKER) {
                    try {
                        CONTROLS.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                CONTROLS.addLast(new Control());
            }
            System.out.println("The worker 【" + Thread.currentThread().getName() + " 】  is working ...");
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            synchronized (CONTROLS) {
                System.out.println("The worker 【" + Thread.currentThread().getName() + " 】  END capture data ");
                CONTROLS.removeFirst();
                CONTROLS.notifyAll();
            }
        }, name);
    }

    private static class Control {
    }
}