package ch9;

/**
 * 6.线程同步问题
 * @author TaoZhang
 *
 */
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();
 }
 public void run(){
 timer.add(Thread.currentThread().getName());
 } 
}

class Timer{
 private static int num = 0;
 public /*synchronized*/ void add(String name){ //写法2:执行该方法的过程中,锁定当前对象
 	//synchronized (this) { //写法1
	 num ++;
	 try {Thread.sleep(1);} 
	 catch (InterruptedException e) {}
	 System.out.println(name+", 你是第"+num+"个使用timer的线程");
	//}
 }
}