Thread t1 = new Thread(new T1());
Thread t2 = new Thread(new T2());
Thread t3 = new Thread(new T3());
t1.start();
t1.join();
t2.start();
t2.join();
t3.start();
t3.join();
主要是使用了join()方法
看看jdk的join方法是如何实现的吧
public final synchronized void join(long millis)
throws InterruptedException {
long base = System.currentTimeMillis();
long now = 0;
if (millis < 0) {
throw new IllegalArgumentException("timeout value is negative");
}
if (millis == 0) {
while (isAlive()) {
wait(0);
}
} else {
while (isAlive()) {
long delay = millis - now;
if (delay <= 0) {
break;
}
wait(delay);
now = System.currentTimeMillis() - base;
}
}
}
即线程将会一直循环isAlive(),直到false