Java多线程(十)线程间通信 join
若果主线程想等待子线程执行完成之后再结束,可以用join方法
join 和sleep区别 join内部有wait实现,所以当执行join方法后,当前线程的锁被释放,那么其他线程就可以调用此线程的同步方法了。
public class Run { public static void main(String[] args) throws InterruptedException { MyThread myThread = new MyThread(); myThread.start(); myThread.join(1000); //Thread.sleep(1000); System.out.println(" end time=" + System.currentTimeMillis()); } }
MyThread
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
public class MyThread extends Thread{ public void run(){ try { System.out.println("begin time="+System.currentTimeMillis()); Thread.sleep(2000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }