阅读下面程序: public class ThreadTest public static void main(String args[]) throws Exception int i=0; Hello t=new Hello(); ______; While(true) System.out.println( Good Morning +i++); if(i==2&&t.isAlive()) System.out.println( Main waiting for Hello! ); t.join(); 等待t运行结束 If(i==5)break: class Hello extends Thread int i; public void run() while(true) System.out.println( Hello +i++): If(i==5)break; 为使该程序正确执行,下画线处的语句应是
A.sleep()
B.yield()
C.interrupt()
D.start()