下列程序的功能是在监控台上每隔一秒钟显示一个字符串“你好!”,能够填写在程序中画线位置,使程序完整井能正确运行的语句是 public class Exam implements Runnable {public static void main(String args[]){ Exam t=new Exam() Thread tt=new Thread(t); tt, start();}public void run() {for(; ;){ try{ : }catch(e){} System.out.println(“你好!”); }} }
A.sleep(1) RuntimeException
B.sleep(1000) InterruptedException
C.Threasleep(1) InterruptedException
D.Threasleep(1000) InterruptedException