ReetranLook

AsynDemo.java

package com.pivincii;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class AsynDemo {
    Lock lock = new ReentrantLock();

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

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