56. 阅读下列程序
public class ThreadTest2{
public static void main(String args[ ]){
PrintWords p = new PrintWords();
Thread t = new Thread(p);
Thread tt = new Thread(p);
t.start();
tt.start();
}
}
class PrintWords implements Runnable{
int i=0;
String str[ ]={"sky","river"};
String name;
public void run(){
while(i<2){
System.out.println("i="+i+' '+str[i%2]);
i++;
}
}
}
程序运行后，可能出现的运行结果是______。
