现有: <br /> class ThreadBoth extends Threaa implements Runnable  {     <br /> public void run()  (System.out.print("hi");  }    <br /> public static voicl main (String  []  args)  {    <br /> Thread tl=new ThreadBoth():     <br /> Thread t2 = new Thread (tl):    <br /> tl.run():     <br /> t2.run():    <br /> }         <br /> 结果为:()      
A、 hi hi
B、 hi
C、编译失败
D、运行时异常被抛出