通过实现Runnable接口创建线程，请在画线处加入正确的代码完成此程序 【9】 。
public class ThreadTest
public static void main(String args[ ]
Thread t1 = new Thread(new Hello()
Thread t2 = new Thread(new Hello()
___________;
t2.start();
class Hello implements Runnable
int i;
public void run()
while (true)
System.out.println("Hello"+i++
if(i==5) break;
