Synchronized function

AsynDemo.java

package com.pivincii;

public class AsynDemo {
    
    synchronized public void countTo(int value) {
        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();
    }
}