java多线程（2） 线程同步

package com.cy.thread;

public class TestSync implements Runnable{
    Timer timer = new Timer();
    public static void main(String[] args) {
        TestSync test = new TestSync();
        Thread t1 = new Thread(test);
        Thread t2 = new Thread(test);
        t1.setName("t1");
        t2.setName("t2");
        t1.start();
        t2.start();
    }
    
    @Override
    public void run() {
        timer.add(Thread.currentThread().getName());
    }

}

class Timer{
    private static int num = 0;
    public void add(String name){
        num++;
        try {
            Thread.sleep(1);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(name+",你是第"+num+"个使用timer的线程");
    }
}