start 和 join

[alluser]

java中thread类有start和join方法，有什么区别？
他们两个到底谁调用run方法？

[wanglh2000]

start调用run方法

[xutaiqing520]

start调用run方法启用线程。
join方法带有一长整形参数，意为线程等待指定的时间后死亡。

[alluser]

如果说是start调用run，在这段代码中，为什么去掉join就不调用run了呢？
public class Deadlock implements Runnable {
Deadlock grabIt;
public static void main(String args[]) {
Deadlock dlk1= new Deadlock();
Deadlock dlk2= new Deadlock();
Thread t1= new Thread (dlk1);
Thread t2= new Thread (dlk2);
dlk1.grabIt = dlk2;
dlk2.grabIt = dlk1;
t1.start();
t2.start();
System.out.println("Started");
try {
t1.join();
t2.join();
}
catch(InterruptedException e) {
System.out.println("error occurred");
}
System.exit(0);
}

public synchronized void run() {
try {
Thread.sleep(1500);
}
catch(InterruptedException e) {
System.out.println("error occurred");
}
System.out.println("run...");
grabIt.syncIt();
}
public synchronized void syncIt() {
try {
Thread.sleep(1500);
System.out.println("Sync");
}
catch(InterruptedException e) {
System.out.println("error occurred");
}
System.out.println("In the synchIt() method");
}
}// end class

[alluser]

没有人知道么？

[alluser]

很奇怪