Java-- join源代码测试

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();
// 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) {
}
}
}
}