happens befor 原则？

public class T extends Thread {

@Override
public void run() {
System.out.println("a");
throw new RuntimeException("runtionException");
}

public static void main(String[] args) {
new T().start();
System.out.println("b");
}

}

执行结果是什么情况？

1：

b
a
Exception in thread "Thread-0" java.lang.RuntimeException: runtionException
at T.run(T.java:7)

2：

Exception in thread "Thread-0" java.lang.RuntimeException: runtionException
at T.run(T.java:6)
a
b
3：

b
Exception in thread "Thread-0" java.lang.RuntimeException: runtionException
at T.run(T.java:6)
a
4：

Exception in thread "Thread-0" b
a
java.lang.RuntimeException: runtionException
at T.run(T.java:6)
5：

Exception in thread "Thread-0" java.lang.RuntimeException: runtionException
at T.run(T.java:6)
b
a