假设此演示中使用了两个线程 increment() 代码块首先执行并获取当前对象上的监视器。其他线程是否不能执行该方法 decrement() ? .
有人能帮我理解吗？
如果我运行了这个应用程序，其他线程就可以执行非同步方法，即使它锁定了休眠线程持有的对象 10000 ms .

package com.learn.threads;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ThreadDemo {

    int sharedVariable;

    public ThreadDemo(int sharedVariable) {
        this.sharedVariable = sharedVariable;
    }

    public synchronized void increment() throws InterruptedException {
        Thread.sleep(10000);
        this.sharedVariable++;

    }

    public void decrement() throws InterruptedException {
        this.sharedVariable--;

    }

    public static void main(String[] args) throws InterruptedException {

        ThreadDemo task = new ThreadDemo(0);

        ExecutorService incrementExecutorService = Executors.newFixedThreadPool(2);
        for (int i = 0; i < 6; i++) {
            incrementExecutorService.submit(() -> {
                try {
                    task.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            });
            Thread.sleep(5000);
            incrementExecutorService.submit(() -> {
                try {
                    task.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            });

        }
        Thread.sleep(35000);
        incrementExecutorService.shutdown();
        System.out.println(task.sharedVariable);

    }
}