线程同步

public class Timer {
	private static int num = 0;
	public synchronized  void add(String name) { //在执行这个方法过程中，当前对象被锁定
		num ++;
		try {
			Thread.sleep(1);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(name + " 你是第"+num + "个使用Timer的线程");
	}
}

public class TestSync implements Runnable{
	Timer timer = new Timer();
	public static void main(String[] args) {
		TestSync testSync = new TestSync();

		Thread t1 = new Thread(testSync);
		Thread t2 = new Thread(testSync);
		t1.setName("t1");
		t2.setName("t2");
		t1.start();
		t2.start();
	}
	public void run() {
		timer.add(Thread.currentThread().getName());

	}
}