Java– join源代码测试详解编程语言

public class JoinTest { 
 
	public static void main(String[] args) { 
		// TODO Auto-generated method stub 
		Thread t1 = new ThreadA();//利用多态实例化一个A线程 
		Thread t2 = new ThreadB(t1);//利用多态实例化一个B线程 
		t1.start(); 
		t2.start(); 
	} 
 
} 
 
/*继承于Thread的子类*/ 
class ThreadA extends Thread { 
	public void run() { 
		for (int i = 1; i <= 20; i++) { 
			System.out.println(i + "  ￥￥￥"); 
			try { 
				Thread.sleep(1000); 
			} catch (InterruptedException e) { 
			} 
		} 
	} 
} 
 
/*继承于Thread的子类*/ 
class ThreadB extends Thread { 
	private Thread t; 
 
	public ThreadB() { 
	} 
 
	public ThreadB(Thread t) { 
		this.t = t; 
	} 
 
	public void run() { 
		for (int i = 1; i <= 20; i++) { 
			System.out.println(i + "  ###"); 
			try { 
				Thread.sleep(1000); 
				if (i == 10) { 
					t.join();// join 使这两个线程进入串行状态（也就是说t突然插了进来，必须等t执行完毕之后，才会让B线程继续执行） 
				} 
			} catch (InterruptedException e) { 
			} 
		} 
	} 
}