synchronized example

AsynDemo.java

package com.pivincii;

public class AsynDemo {
    private Object mutex = new Object();

    public void countTo(int value) {
        synchronized (mutex) {
            int count = 0;
            while (count < value) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                count++;
                System.out.println(Thread.currentThread() + " counted " + count);
            }
        }
    }

    public static void main(String[] args) {
        AsynDemo asynDemo = new AsynDemo();
        new Thread(() -> asynDemo.countTo(3)).start();
        new Thread(() -> asynDemo.countTo(3)).start();
    }
}